Halo: The Master Chief Collection is now listed on Steam and the WIndows Store as upcoming. No date is set but enthusiasts can add it to their wishlist and Steam will alert when the game is released.
We are disappointed that Halo 5 will not be included in the collection. Halo 5 was in beta when the Xbox version of the Master Chief Collection was released. The PC version is being released down the road so there is no real reason that 343 Industries cannot add that to the bundle.
We know that the package will require 64-bit Windows which is what the Xbox uses no other system requirements are known. Most likely a rig with Xbox One performance or better will be needed do sny video card from a GeForce GTX 660 Ti or better should be fine. The Radeon RX 480 8GB can handle Halo at 4K fine. The old GTX 690 can also handle Halo at 4K fine.