I saw it.
It is a very "sped up" version of the book. Peter and Valentine's secondary story is pretty much left out--which is understandable. I will say they were very true to the book and did a good job.
I'd have loved if the movie had been an hour longer with more content. The movie is basically the short story that was first published before the book.
I don't do spoilers but while the movie ended cleanly it sure looked like a set-up for a sequel.
The Ender stories--despite all the hype--don't appeal to everyone. I thoroughly enjoyed it and thought the adaption for film was as good as the book...and watching it really felt like reading it most of the time.
No stupid Hollywood plugins. The only kiss from a girls Ender gets is fron his sister and the only hands he holds is training in the combat room.
I'd have liked to see it in Imax.