The reply he received was not from Hollywood but from Orson Scott Card himself. You can read the letter in its entirety here, but I've copied what I feel to be the most important parts below (contains spoilers):
"Also, the book would make a movie that was at least four hours long. Much has to be cut - including all of Peter's and Valentine's online exploits, the mind game, and much of the incidental material before Ender gets into Bonzo's army.
In short, much will be omitted. But I remain confident that as long as the character of Ender himself, with his relationships with other kids, is in the movie, it will still be Ender's Game to my own satisfaction and the satisfaction of the fans.
Again, thanks for your interest in EG and for caring that the film be done well. But here is my own source of greatest confidence: The movie will not erase a single word of the book! That's how I endure knowing that Peter Jackson committed the repulsive crime of removing the Scouring of the Shire from the Lord of the Rings movie, which is akin to removing the last chapter from EG. THAT, at least, I know will not happen in the EG movie."This letter is from October 2011, mere weeks before Asa Butterfield was officially cast as Ender. I suppose if anyone was going to know intimate details about the script at that time, it would have been him, especially since Gavin Hood's version of the script was a re-write of one of Card's.
I admit to being disappointed that most of the Valentine/Peter escapades are most likely not going to make it into the movie, but it's understandable that many scenes taking place on Earth would be cut. And Card had previously mentioned in an earlier interview that most of the Battle School going-ons before Salamander Army were going to be omitted entirely.
But Free Play? The fantasy game? If they plan on including the final chapter, how will Ender understand that the Formics had left him a message unless he recognizes the Giant and the playground? I suppose they'll find a way around it, but it seems an almost unnecessary change.
Truthfully, I think I was just looking forward to seeing Ender's little character whimsically dig into the Giant's eye and meet the jolly bat. I'm fond of that bat, really.
What do you guys think? Do the cuts mentioned above make sense to you? Which scenes do you think are pivotal to the plot and should not be left out?