I thought 360 was funny, since if you think of it as degrees of a circle, they'd be right back where they started.
Of course now that they've already used Xbox 360, it's not like they could use Xbox 3, and expect it not to cause a lot of confusion. So MS has kind of backed themselves into a bit of a corner, unless they want to name the Xbox kind of like Sony did with the PlayStation Vita. I'd vote for Albatross myself, but maybe only as an internal codename.
Sure it's double 360 but Xbox 1080 may help fold catch on it's all HD. And 3D to boot.
They have a few years to sort that out. "3D" is a little overused so I doubt they could get any mileage by adding that to the product name.