Halo 3 and classifies "Bootcamp" as a PC/Online game.
In a comment to GameFront, Microsoft dismissed any association with Xbox One, which would suggest the new TV series in the works is ruled out. Microsoft also denied any connection with the Reclaimer saga started with Halo 4 in the same statement.
Speculation is this could be a PC port of Halo 3, though Microsoft doesn't seem to be addressing that question either. We've reached out for comment.