hmm, since the PlayStation brand is larger, the Xbox 360 doesn't sell as well as the PS3 in regions outside North America and the UK, and the PS4 can always rely on Japan to add 10 million sales, I'm going to say that the PS4 will win next generation. Also, the 360 won in regions which have shown to be least loyal to a specific brand, so saying that the Xbox will own the US is something that can't be predicted right now. So with those things considered, the PS4 might do really well.
Ofcourse, things going against the PS4 are that it is only a console with improved graphics, it will probably be expensive, and it doesn't have a gimmick to appeal to casuals (the PS Eye thingy could appeal to casuals but the Kinect 2 should be more impressive).
So the PS4 might win in sales but I doubt it will win in profits.
I'm predicting
PS4: 80 million
Nextbox: 70 million
WiiU: 30 million
NNID: FrequentFlyer54
