gwilym101 said:
As far as I remember his politics isn't really present in the books at all.
I'm hopeful this will be good, but the book is really dark and there is so much behind the scenes work in the book as Ender is viciously manipulated all the time. Plus I'd have thought it would be in two parts one for the battle school and one for the command school, my concern is they're going to cut a lot of the gritty-ness out.
From what Asa Butterfield (actor playing Andrew 'Ender' Wiggin) has said the film is still pretty dark and gritty, but of course anyone expecting to see naked boys running around is naive or possibly deluded; Asa says he thinks they're aiming for PG-13 (You can get away with a lot at that rating these days) so just don't go in expecting to see an 18/R rated film.
Source:
http://www.endersansible.com/2013/05/08/asa-butterfield-ama/
And as for why it hasn't been broken down into battle and command school, well I honestly think it's because there wouldn't be enough material for two films, and that they had to compress the amount of time that passed in the film for what ever reasons, mainly because finding two or possibly even three sets of actors for all the kids as they age from 6 to 11/12 would be too hard or costly or both.