Possibly lost in the excitement of a brand new "Guardians of the Galaxy" trailer was the Facebook chat that preceded the reveal. Not only was Groot (Vin Diesel) present, but fans also got answers directly from Star-Lord (Chris Pratt), Drax (Dave Bautista), Nebula (Karen Gillan), director James Gunn and Marvel head honcho Kevin Feige.

As if the lineup wasn't good enough, we also learned a lot about the movie. Here are the six biggest secrets we learned from the chat:

1. Vin Diesel Isn't Thanos

The Marvel uber-baddie who last showed up at the end of "The Avengers" does have a role in "Guardians." In fact, he's already been cast… But he's not being played by Vin Diesel as rumored, at least according to Gunn.

2. An "Avengers" Crossover Is Happening

Sorry, the Guardians will not appear in "Avengers: Age of Ultron," though Gunn doesn't rule out further appearances in other Marvel movies. However, when asked whether there would be Easter eggs for "Avengers 2" or the third movie in "Guardians," Kevin Feige simply said, "Yes."

And when it comes to connecting with the upcoming second season of "Agents of S.H.I.E.L.D."? "Maybe," Gunn said.

3. Cameos

No, there's no cameo from the X-Men's Mystique, or the slightly more shareable Hulk (as Mystique is with FOX, while Hulk is with Disney/Marvel). However, you can expect Easter eggs for the original "Guardians of the Galaxy" line-up from the comics. The team depicted in the movie is a more modern roster.

Oh, and this should be obvious, but Gunn teased there would be after-credits scenes, so make sure not to get up before the credits roll.

4. The Rating & Length

We're getting pretty technical, but Gunn stated that they were very close to a final cut for the movie. All told, it will be about two hours long, and Gunn said they're, er, gunning for a PG-13 rating. That's pretty consistent with the rest of Marvel's output.

5. Bring On The Bad Guys

As much as we love the new "Guardians" poster, whither Lee Pace's Ronan, Nebula and Korah The Pursuer (Djimon Honsou)? Worry not: Gunn says a villain-focused one-sheet should be hitting very soon.

6. "Guardians of the Galaxy 2"

It might be a little early to talk about a sequel, particularly as Gunn said he spent the past two years doing nothing but working on the movie. However, he added, "I believe I am contractually obliged to do that whether I want to or not. But, of course, I'd love it. I love these guys so much -- the guys at Marvel and the cast. They've become very close friends."

"Guardians of the Galaxy" opens in theaters on August 1.