A Halo game titled "Bootcamp" has been registered on the Korean Game Rating Board.
According to raven777 who first reported the discovery on NeoGAF, the game is described as a part of the Halo universe and is designated as a "PC/online game", which could be released in either a package or released online.
The game's description reads as follows:
"A Third-Person Shooter game based on 'Halo' universe where player complete various types of missions."
The page is definitely legit, and running it through a translator reveals the following information:
Beyond the basic information about the game it's hard to say what it's about, at which point in the Halo universe it is set, who the main characters are, or who is developing it. We'll post updates as they come.