In anticipation of the new movie, I picked up a copy of Enders Game about a week ago. I'm roughly 75% of the way through it, and I'm kicking myself for waiting so long. It's really good, and now I'm all worried that the movie will screw it up. So much so, I kind of don't want to go see it.
Update: I finished it, a couple days ago. Totally didn't expect the "big reveal" (you know the one.)
Ultimately, I loved the book and can't wait to read the next two. Having said that, I'm still on the fence about the movie. I think I like the idea of blending Enders Game with elements of Enders Shadow though. For a movie based on a book that has a lot of internal dialog, it makes sense to add that in.