http://www.oxm.co.uk/68899/microsoft-confirms-halo-5-for-2014/
So, obviously we've known about A Halo game since E3 this past year, but NOW they're confirming it to be Halo 5.
There's plenty reason to doubt the 'awesome sauce' of the game, because 343i did a pretty terribad job with Halo 4 (IMO).
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I'd laugh if it turn out to only mean Spartan Assault since the 360 launches later this month.