I'd honestly be disappointed if it doesn't hit 90 MC. It looks amazing, I like the camera change, and Kratos has finally mellowed enough to be an interesting character. That's not to say that I didn't like Kratos or find him morbidly hilarious at times, but his shtick got pretty old.
The setting is perfect as well... really, this should be an exceptional game. 15 million is a LOT, though, and that's quite a bold prediction; not sure I can see that.