I feel like MS completely shit the bed as far as their new IPs for the 7th gen went and have very little left. Kameo was nowhere to be seen, Alan Wake and Too Human went through years of development hell to be pretty underwhelming titles upon release, Halo and Gears both experienced a rise and massive fall within just a few years, PGR devs are dead, Dead Rising bafflingly became exclusive after going multiplat, and most of the talent at Rare left ages ago and what's left of the company just makes Kinect shovelware now. Crackdown 2 was also a bit underwhelming, but the core was still enjoyable. MS reps have been seen wearing Crackdown shirts, so there's a chance for Crackdown 3 to rear its head some time soon.
Most of my favorite 360 exclusives have been third party, and I doubt that Mistwalker or From Software will be willing to collaborate with MS on another exclusive. Either way, if Chromehounds 2 or a Lost Odyssey successor surface then it'll be hard for me to resist the lures of the Xbone.