Both games were confirmed to be heading to PC during the E3 - PC Gaming Show (streamed in the PC Gamer's Twitch). Phil Spencer confirmed that Killer Instinct will be ported to the PC. But Windows 10 is the only focus right now. Also, it seems it will allow cross-platform play, with people on the PC playing against the XBone. No Man's Sky, the "3D-Starbond adventure" is also releasing on PC at the same time as the PS4 version.