A user over at Neogaf has posted a list of titles supposedly leaked from Microsoft's E3 press conference.
Halo 5
Killer Instinct
BANJO KAZOOIE 4
FORZA 5
QUANTUM BREAK
HALO: SPARTAN ASSAULT
RYSE
FABLE 4
CRACKDOWN 3
FORTNINE
DEAD RISING 3
COD: Ghosts
BF 4
Witcher 3
Dying Light
PREY 2
Homefront 2
BGE 2
Mirror's edge 2
Rainbow 6 PATRIOTS
Brother in Arms
League of Legends
There is a couple of things that makes me seriously consider this list fake. First of all, Microsoft have put emphasis on bring new IPs to Xbox One. Second, this morning it was rumoured that Arkane are taking over development on Prey 2 (with a release far, far away). Also, I don't see a new Brothers in Arms as very likely at all, not right now anyway. Two Halo titles? Well, it sounds unlikely, but you never know.
The same source also lists Capcom titles, and that list just seems insanely optimistic. So much so, that I won't even publish it here.
Anyway, very likely a fake list. But it's worth thinking about anyway - what do you think we'll see from Microsoft at E3?