I'd love them to announce a new Gears & Halo title, I'm a huge fan of those. If some rumors are true, Gears won't be a traditional 3rd person cover shooter anyway. Different genre with Gears universe is basically a new IP imo. Kind a like Halo Wars. Gears of War is THE series for me.
Sunset Overdrive was a great game but I'm not sure if a sequel is needed. Wouldn't mind it though.
Of course I want to try new IPs too. It just doesn't matter that much whether they're exclusive or multiplat.