It remind me all the Flash game, mario sprited, wich was no interest formostly anyone because it was'nt canon.
and now, We get a little big planet mario(sorry its the only ref I can see as a platformer maker.)
It will be fun, but like little big planet, for a handful of good level designer you will have them drown in a see of crappy really crappy one.
It will go for a time, and rapidly collapse. It will go mostly for the hardcore gamer, and now How much Are they on WiiU