Well, it'll outsell Metroid: Other M and Alan Wake I'll give it that.
Outsell GT5, FFXIII, GoW3, CoD 6, SMG2 and Zelda Wii 2? Possible but very unlikely to outsell GT5.
Outsell Wii Vitality game? I'd bet against it. That'll likely be another 20m seller. Of course, no one knows a damn thing about it yet.
At any rate, it's hyperbole from MS, of course they'll claim the world and it will be marketed like the second coming of Chr, Master Chief.