Looks cool... though when I read the book I kept thinking it should have been an animated movie, that way you could do the kids their proper ages, do the flying effects, the video game immersion thing, all that kinda stuff.  There hasn't really been a big sci-fi CGI movie, has there?  There's been little SF touches with Monsters Inc and Incredibles and Despicable Me, but they haven't really used that for a story like this, where it would kind of be perfectly suited.