I understand the caution.
Maybe just wait until the reveal of the system before you make your decision. But at the end of the day, if you really want it, there's no reason to not get it (unless funds are an issue, of course). The system's library will keep you busy for a while, and it's possible that if the NX does turn out to be backwards compatible and you waited, that you wouldn't be able to experience all the Wii U has to offer anyways since the NX is going to have a library of its own.
The $250 Smash+Splatoon deal is pretty great.








