Whilst 343 Industries are still working on the next Halo game for the Xbox One, they have also been working on something completely unexpected that many fans of the series may be looking forward to. This something has been named Halo: The Master Chief Collection, and it will be a bundle of games that features all four previous Halo titles that follow the story of the Master Chief.
This includes Halo: Combat Evolved, Halo 2, Halo 3 and Halo 4. Games such as Halo ODST, and Halo Reach will not be included in the bundle. According to rumors, all four games will also be 'remastered,' probably in a similar fashion to how Halo: Combat Evolved was remastered in the recent Halo anniversary release for the Xbox 360.
So far it's unclear how the multiplayer will work for this bundle, but it is expected that the Master Chief Collection will come with some kind of online multiplayer matchmaking. It's quite a big project to port all four games into one collection, and so far we aren't sure whether all four games will be available in one single experience, or whether they will be separate standalone titles.
343 Industries also announced that Halo 5: Guardians will be released in 2015, however the Master Chief Collection should be released some time this year for the Xbox One. We'll probably hear more about 343’s exact plans later in June at Microsoft's E3 press conference, which really isn't all that far away now.