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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Why don't they add another year of development to really polish it up? Maybe an extra year under their belt can help draw out more of the XB1's potential. Honestly, with such a short development time and with what we've seen from Halo 4.... don't expect anything groundbreaking or revolutionary. My prediction is a slightly above average sci-fi shooter that you'll grow bored with after 4 months. This is a fate that Halo does not deserve. They should stop making Halo games, and do the series justice by continuing it with a book series that is preferably written by Eric Nylund.