PS4 95m
Xbox3 75m
WiiU 55m
All of the consoles will sell less than their predecessors, WiiU signficantly more so than the others. I don't believe it will have the effect Wii had, this time not all the casuals will be on board. This will force Nintendo to come out with a new console way earlier.
PS4 will be compararable to PS3, with a bigger install base in America. Sony's main focus will be that market.
Xbox3 will be a distant 2nd, it will lose sales to PS4 in America, while not gaining sales elsewhere in the world. Overall the console will be successful enough for Microsoft.









