Among DOOM, DOOM II, DOOM 3 and DOOM 3: Resurrection of Evil, DOOM 3 BFG Edition features the Lost Missions, shown in this trailer, which are eight new levels. The game is out on October 16th. Update: Screenshots added.
@Moonwalker: Microsoft is giving Windows 10 for free to hundreds of millions of people with multiple devices. They are even gradually giving it, though savy users will have used the ISO. (1 minute ago)