No one can say anything about a Marvel movie until the press junket rolls around, which is a bit sad because by that time, people are already looking to the next Marvel movie (live in the moment, people!).  James Gunn's Guardians of the Galaxy is currently shooting in London, and while it was assumed that star Chris Pratt, who plays the half-alien, half-human Star-Lord, would sit out some episodes of Parks and Recreation, he's actually racking up a lot of frequent flyer miles by traveling between Los Angeles and London.  His crazy schedule may not be secret, but when doing an interview on the set of Parks and Recreation, he couldn't say much about Guardians.  However, he did provide a few broad tidbits.

Hit the jump for his comments.  The film also stars Zoe Saldana, Dave Bautista, Lee Pace, Benicio Del Toro, Karen Gillan, John C. Reilly, Glenn Close, Michael Rooker, Djimon Hounsou, Peter Serafinowicz, and Vin Diesel as the voice of Groot.  Guardians of the Galaxy opens August 1, 2014.

Speaking to IGN, Pratt joked that Guardians of the Galaxy is "the greatest movie of the 21st century! That’s what I’ll say. It’ll be the Citizen Kane of movies other than Citizen Kane."  But he also said that one of the things they're focusing on is getting the tone right:

Yeah, I think tone is the major thing we have to accomplish, a consistent tone, going from silly and comedic to high-stakes drama and action, and everything in between. It’s really up to James, and I trust everything that he’s doing.

Pratt also said he hopes Guardians will crossover with the other Marvel movies even though there are no plans to do so at this time:

Man, that would be really cool. What’s nice is that it is all the same universe. Because it falls under the Marvel umbrella, there is the possibility, just like in the comic books, that these stories could intersect…A lot of it’s just going to depend on what people think of the movie and if it makes sense for Marvel to keep making more of them. But I sure hope it does because I’ve never done anything like it. I hope they make ten of them.

But if you really need a spoiler about something that's in the movie, Pratt says we'll be seeing Star-Lord having sex with a couple of aliens.  So there's that.