No prediction other than they wont outsell it this year.
Ps4 is suppose to sell 5m by March. WiiU is at what about 3.5m at this moment? WiiU will likely be around 6-7m by the end of 2013. Both PS4 and X1 will be around 2-4m by the end of 2013. Even so, WiiU only has to sell 1.5m more to equal Sony's numbers by this march if they sell all units.
So in other words, unless you expect PS4 not to have a single console on shelves from January to March then it isnt going to outsell WiiU by the end of 2013







