Phil Spencer: More Xbox One/PC cross play titles coming in 2015

[S.T.A.G.E.]

Ka-pi96 said:
hmm, could be FF XIV Realm Reborn as well maybe?

I think it might start off with exclusives MS can control or has an internal hand in. Eventually it will spread out into third party. Square Enix would probably have to announce that at E3 though, so lets hope you're right.