There are still Comic Con videos trickling in. This one was posted recently by Entertainment Weekly. Watch Asa Butterfield and Hailee Steinfeld talk about Petra being the only girl, Graff being the “overbearing tyrant” of Battle School and their favorite thing to shoot. Also, Asa Butterfield speculates on when the Ender’s Game movie is actually set.
I’m not sure I believe the 50 year time frame. Maybe he means that that is when the first invasion occurs?
Source: EW’s Youtube Channel