The official online Microsoft Store have added a synopsis for Halo Xbox One to their website which seems to give us a hint at the story for the upcoming game in 2014.
In possession of a mysterious data chip, Petty Officer John-117, aka Master Chief, confronts a new battery of challenges and tests in a Herculean effort to stay alive in a galaxy where sentient life is mercilessly hunted. Pre-order the next chapter in the wildly popular Halo series designed exclusively for Xbox One.
You can check out the Halo Xbox One page on the Microsoft Store here.
UPDATE: Microsoft have taken down the Halo Xbox One page on the Microsoft Store.
UPDATE 2: Frank O’ Connor from 343 Industries has commented on the synopsis:
So the rank was wrong, the chip isn’t supposed to be mysterious and sentient life seems more likely to wear camouflage and walk than say, trees.
Bombadil should have helped whatever hapless employee wrote that.