OK, let's not get ahead of ourselves. Casting the entire saga right now would be crazy talk! Let's start with the Big One: brilliant young child prodigy Ender Wiggin, the kid at the center of it all.
For inspiration, may I point to the young kids from Super 8? Or, depending on how long it takes Hood to pull production together (Deadline reports that he's working on a presentation for Cannes), that talking E*Trade baby? What a talent. With a franchise like this it's safe to guess that Summit might search for an unknown talent to fill the role, but have at it in the comments below!
ยท Franchise-Hungry Summit Plays 'Ender's Game' With Filmmaker Gavin Hood [Deadline]