Welcome back, PC nerds!
Halo: Master Chief Collection is coming to Steam "soon" and it will include Halo Reach, which will also be added to the Xbox One version of the game. The multiplayer portion will be a free add-on while the campaign will cost extra. On Steam the games will be released in chronological order, starting with Halo Reach rather than all at once so that players can start playing them as soon as possible rather than having to wait for the entire collection to be completed. The games will run at 60 FPS and support 4K.