The Mandalorian Theory: Baby Yoda Saw Luke's Jedi Order In The Force
Grogu, aka Baby Yoda, meditates in the Force in The Mandalorian season 2, episode 6, "Chapter 14: The Tragedy," and it's possible his vision was of Luke Skywalker and his Jedi Order, while perhaps allowing Luke to sense his presence on Tython as well. As instructed by Ahsoka Tano in the previous episode, Din Djarin took Baby Yoda to Tython and placed him on the Seeing Stone, allowing him to reach out in the Force and find his path. Unfortunately, Moff Gideon and his Dark Troopers arrive and capture Grogu before any potential Jedi savior can arrive, but it's nonetheless possible someone did become aware of the Child.
With the action more focused on the efforts by Din, Boba Fett, and Fennec Shand to take on the Imperial forces who arrive on the planet and protect Grogu, there's no real clue given as to what Baby Yoda experiences in the Force. However, given that he appears to be mediating for so long, then it's likely he had a vision, or visions, or certain things. This was supposed to be guiding Baby Yoda, after all, so it would make sense for the Force to show him something that helps his decision.
There are a few possible options for what Baby Yoda saw, assuming he did indeed see anything. While it's possible it was just a series of vague images that are open to interpretation, or that it was something much closer to home (like Moff Gideon and the Darksaber), the most compelling idea is that it was linked to Luke Skywalker. Luke is the only Jedi who is truly active at the time of The Mandalorian, and while having him appear may still be something of a long shot, it would make sense for Grogu and he to be on the path to finding each other.
If the Force was showing Baby Yoda the possible paths he might go down, then Luke Skywalker's fledgling Jedi Order would presumably be a part of that. While Luke's Jedi Academy hasn't started just yet - The Mandalorian takes place in 9ABY, so it's a few years off Luke starting to train Ben Solo and looking to re-build the Order - it is on the horizon, and a few years isn't much where the Force is concerned. Grogu has already been trained as a Jedi once, back in the days of the Clone Wars, where he had several masters. Presumably, now he's re-connected with the Force, using his powers again, and Mando is looking to reunite him with the kind, then showing where his Jedi future lies would be part of what he sees, and there's no real Jedi future outside of what Luke will be doing.
There are other Jedi alive during The Mandalorian's timeline - Ezra Bridger likely is, but his whereabouts and status are unclear; Ahsoka has been introduced, but has left the Order; and former Jedi Naq Med is still around, but similarly has left those ways behind - yet none are in a position to train Baby Yoda, and so naturally wouldn't be what the Force shows him. If Grogu is to be trained as a Jedi, then Luke is the best (and arguably only) option left. Since he will be gathering students in a few years, and is currently searching for artifacts relating to the Jedi and Sith before doing so, then he would represent Baby Yoda's Jedi path.
Of course, if Baby Yoda's Force vision in The Mandalorian showed him Luke's Jedi Academy, then it could also show him what fate ultimately befalls it. While Luke's attempts to rebuild the Order start off in promising fashion, they hit a snag - it put it very mildly - with the little issue of Ben Solo turning to the dark side, destroying the Jedi Temple, and killing Luke's other students. This isn't entirely Ben's fault, as he had been manipulated by Palpatine, who Star Wars has suggested was truly responsible for burning down Luke's Temple. Nonetheless, that's where the story of Luke's attempts to rebuild the Jedi Order end: having played his part in his nephew's downfall by igniting his lightsaber, and witnessing the outcome, Luke exiled himself, and the Jedi were no more until Rey's rise and Luke's return.
It remains to be seen if Star Wars will reveal that Grogu was a part of this Jedi Academy, and perhaps even a victim of Kylo Ren's wrath, but right now there's at least a chance of it happening, and Baby Yoda might even have seen it. Force visions are often warnings of dark moments to come: Luke himself leaves Dagobah because of a vision of his friends in trouble on Cloud City in The Empire Strikes Back; in Star Wars: The Clone Wars, Yoda had a vision of Order 66, though he didn't fully interpret or heed it; in Star Wars: The Rise of Skywalker, it's revealed that Leia saw her son turning to the dark side if she continued training as a Jedi, and so decided to quit. The Force might well be doing something similar with Baby Yoda, showing him the Jedi path and what could happen if he goes down it.
Right now, Baby Yoda's future - both short and long term - hangs in the balance. The Seeing Stone was supposed to help him choose his path, but it's unclear if or how it did that, though The Mandalorian season 2, episode 6 might have hinted at it. At the end of "The Tragedy," Grogu is found tossing around and Force choking Stormtroopers like they're nothing but toys (and ones he isn't particularly fond of at that), which may suggest a turn to the dark side. That's certainly what Moff Gideon hopes, as he encourages the Child's ostensibly evil behavior. If he had a vision of joining the Jedi Order only for it to be slaughtered yet again, a tragedy he's already experienced once, then it might provoke greater fear and anger in him, leading to the dark side.
At the same time, Force-sensitive children tend to be neutral; they don't use the Force in binary terms of light and dark, but simply channel it in a more instinctive, natural way, and so Baby Yoda's Force choking doesn't necessarily mean he's turning to the dark side, but there is also no guarantee he wants to be a Jedi either. Although Baby Yoda doesn't yet speak, it is still possibly to gauge his responses to certain things, like how he enjoys Din Djarin calling him Grogu. He doesn't seem to react enthusiastically to the idea of being trained by a Jedi anyway, and so if he does have a vision of Luke's Jedi Order and what happens to it, then he would be even more reluctant to go down that path.
That would then beg the question of just what Grogu does choose, if he rejects the Jedi but also isn't going to the dark side. The most likely answer is that he wants to stick with Din, whom he's formed a close bond with. Intriguingly, the end of "The Tragedy" also teases Baby Yoda's interest in the Darksaber, which could offer a best-of-all-worlds end point for the Child: mixing his Jedi past with his Mandalorian present, claiming the Darksaber and becoming the second ever Mandalorian Jedi, inspired to walk this almost unique path by knowing he can't become a traditional Jedi under Luke, but that he shouldn't leave the Force behind altogether.
While it's fascinating to think about what Baby Yoda saw in the Force in The Mandalorian season 2, episode 6, it's also equally intriguing to consider the inverse: who saw him? Ahsoka noted that, in opening himself up to the Force via the Seeing Stone, a Jedi may sense his presence and be able to find him, even though there aren't many Jedi left. While it could be some unknown survivor of Order 66 who appears, or a different kind of Force-user who becomes aware of Grogu, once again the obvious option is Luke Skywalker. Since Luke is already searching for things connected to the Jedi, then he'd presumably be more sensitive to any such callings in the Force, even if he would be too late were he to visit Tython.
Introducing Luke wouldn't be without its issues for The Mandalorian, given the sheer size of the character and what he means, which would dwarf even fan-favorites like Ahsoka and Boba Fett. But at the same time, the creatives decided to set it in the aftermath of Return of the Jedi and have started connecting it to all other corners of the Star Wars universe: it continues character arcs from the animated shows, builds on the ending of the original trilogy, and is setting up sequel elements such as the First Order, so Luke appearing is not unprecedented. If he were to appear - whether it's a de-aged Mark Hamill or a recasting (perhaps finally giving some fans the Sebastian Stan fan cast they wish for) - then it could be used to further develop Baby Yoda's Force powers and help him better choose a path. Luke may or may not take Grogu into his Jedi Order, but he could at least help save him, and teach Mando more about his species, helping him on his journey.