Huh, I just reviewed the major announcements before I strolled over here and I have the opposite impression. The backwards compatibility is a good move, but more of a delayed feature that should have been there at launch. More subjectively, I can't think of anything exclusive to the 360 library that I missed.
Rare's new pirate MMO game is completely unappealing to me. The Replay collection is cool, but not mind-blowing. Gears 4 looked really underwhelming, but at this point I think the franchise is just played out. That Recore game looked the most promising, but showed no gameplay, and is from Armature, which has not produced anything decent. Otherwise the AAA landscape is looking like it's banking on a lot of safe sequels. Dark Souls 3, Tomb Raider Reboot 2, Dishonored 2, Fallout 4, Halo 5, Forza 6.