Looking at options to add support for both
When Call of Duty: Black Ops II arrives on the Wii U and PC it will do so without Call of Duty Elite support, according to Activision. The company says that they are examining options to offer Elite on the Wii U and PC, but at launch it is confirmed for certain that it will not be supported on the Wii U and PC.
The PC never did get Elite for Call of Duty: Modern Warfare 3; but perhaps because of the new free offerings that are a part of Elite this time around, it could be that Black Ops II might stand a much better chance in seeing this happen.
So, if you want to make use of Elite, then you are going to have buy either the Xbox 360 or PlayStation 3 versions of the game out of the gate. It is hard to say how much Activision is into getting Elite on those two platforms, but short of the fans really crying out to Activision for it, it is hard to see into our crystal ball and predict if it will happen or not.