Al Ewing has mentioned that Genesis War was originally going to be a year-long arc, so clearly things were accelerated.
Was that a Feige decision? I don’t know. I’m more inclined to think it was Dan Buckley, Marvel President and Publisher, seeing as we know he was the one who asked Brevoort to take over X.
Why? It could be as simple as thinking that mid-summer was a better time for a relaunch than mid-Winter.