Everything we know about MTV's 'The Hills' reunion, so far

• "The Hills" is coming back on MTV.
• The premiere date isn't set yet.
• Old cast members like Spencer Pratt, Heidi Montag, Whitney Port, Audrina Patridge, and Brody Jenner are returning.
• There will be some new faces — including Mischa Barton and Kyle Massey.

In August, most of the cast of MTV's reality series "The Hills" reunited on the pink carpet of the MTV Video Music Awards for a special announcement: the network was planning to do a reboot of the show, which was a huge reality television hit back in the early 2000s. The reboot is titled "The Hills: New Beginnings" and will appear on MTV sometime in 2019.

At the time, MTV released a short teaser video for the series, which would follow many of the stars through their lives as adults with families and significant others. The teaser, which consisted mainly of shots of the beach and Southern California, didn't reveal much about the show. But with the news of the reboot's release date, we now know a lot more about what to expect when it airs:

SEE ALSO: Best moments from MTV's 'The Hills'

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It's reportedly going to premiere in summer 2019.

Although Cosmopolitan originally reported that "The Hills: New Beginnings" would premiere in April of 2019, it looks like it's going to be later than that. Multiple sources told Page Six that the show was set to premiere in the summer, although we still don't know the exact date the series premiere will be released.

Lauren Conrad isn't going to be involved.

When the reboot was first announced, the first thing everyone wanted to know was if Conrad, who was the main character for much of the original series, would be part of the cast. For anyone who was hoping to her reunite with the cast, the answer is an unfortunate no.

A source confirmed that to People, saying, "She's in a different place in her life. But she wants everyone to enjoy themselves. She wishes everyone the best." Conrad is currently busy working on her line for Kohl's, running her website, and managing her nonprofit, The Little Market, as well as being a mom to her son Liam.

Kristin Cavallari won't be part of the cast either.

Conrad's TV frenemy Cavallari isn't going to be joining in on the reboot either. A source told People, "She can't do the show because she has a contract with E! but she's still close with Heidi [Montag] and Spencer [Pratt] and is excited for them." Cavallari is working on her own reality show called "Very Cavallari" for E!

She told Us Weekly that she's disappointed she can't be on the reboot, saying, "I wish I could be part of it, I really do, and so it's just one of those things. I wish I could make a little cameo or something!"