During Microsoft's presentation at E3, a Halo trailer for Xbox One was shown, however Microsoft denied that the game was Halo 5. Today a new trailer for the game was revealed, although it's exactly the same as the one shown at E3, the "Halo 5" logo appears at the end of the trailer.
Although this was fairly predictable, this may mean that both Microsoft and 343 Industries are preparing to reveal more details about the game soon. All we know about the game is that it will run at 60 fps, and that it will be taking advantage of the new cloud features the Xbox One is featuring.
This new entry in the Halo series will be released in 2014 for Xbox One.