Seems to be legit and not surprising. It doesn't sound like Microsoft is getting its money from the W10 store. I mean, who would have thought that requiring a specific version of an operating system and selling your few games through a poorly executed store that can't even begin to compete with Steam, or even Origin for that matter, would be a bad idea?
http://www.dualshockers.com/killer-instinct-announced-steam/
Legit.
http://www.dualshockers.com/killer-instinct-announced-steam/
Legit.