The only thing I know about Enders Game is that Harrison Ford is in it.
As for movie version, it happens all the time with me, and anymore I actually expect to be disappointed by the movie version, tv version, etc.
Like 1984. The film version with John Hurt was austere, lacking humor and the quality of the subtle humanities in the book. I read the book seeing in my mind The Transamerica Building in San Francisco on a sunny orange day broken by the presence of surveillance copters and wall-sized television monitors, and cloudy, sooty red brick alleyways where the incinerators were in the book, like the alleyways where the homeless take a crap, wiping themselves on The Daily News, near the St. Martin Hotel in the low rent district, like the center of Downtown Los Angeles.
If I made "1984", it would look more like the Dennis Hopper film, "The Hot Spot", but with adherence to the book.
I haven't even bothered looking at the current tv series, "Dracula", having lived with the book for 20+ years as a personal exercise in scripting a difficult book to film, just in case I end up there due to family. I don't like what I've read about the series, with Prof. Van Helsing using time machines and other tools of hack script writers.