Microsoft is gradually moving further and further away from the console market and closer to being a game publisher. The next Xbox is supposedly going to be basically like a PC, based on Windows and with access to multiple game stores as opposed to a walled garden system like consoles traditionally have been. Something more akin to the Steam Box that Valve tried to push.
It wouldn’t be surprising at all if they released WoW on that, but obviously with full keyboard and mouse support in a version that isn’t very different from the PC version, if at all. But since Microsoft is moving away from the console market and more towards selling content it seems pretty clear that they aren’t even trying to compete with the Playstation any more.