It appears that Blizzard Entertainment are working on a version of Diablo III for Xbox One if product pages at several retailers are to be believed. Argos and Best Buy among others are listing Diablo III on Xbox One.
Diablo III was originally announced for consoles at the PS4 unveiling in February last year and very little was said of the Xbox 360 versions that wound up being released alongside the PS3 edition. Perhaps Xbox One will get its version alongside the PS4 edition in similar fashion?