Go buy it now. If you have a Wii U its a must own for the console. I cannot stop playing, I am writing this while on the toilet because thats the only time I'm away from that *crag*ing game.
I'm not so sure how good the ports to other systems are, I'm sure they're fine but keep in mind this is a game that was built from the ground up for wii U and after it was finished they decided to port it, so take that into account.
There is a boatload of content in this game, I mean I beat level one and unlocked like a million *crag*ing things I mean jesus what the *crag* is even going on here why am I unlocking rayman origins in this shit what the *crag* are these cratures is this what nintendogs looks like in france jesus.