Just thought I'd point it out, at no point was the number 5 mentioned at all...
I'm betting it'll be a remastering of the Xbox/Xbox 360 Halo games for Xbox One, with a port of Halo 4's multiplayer, it makes more sense really.
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Because with the Xbox One they are rebranding their titles probably. Halo 5 will just be Halo. A fresh start, but continuing the same storyline unlike DMC. Then the subsequent Halo 6 might be Halo : insert subtitle. They might do the same for Fable I guess. Killer Instinct is just being called Killer Instinct, right?