At the moment it appears to be announced for only Japan, but I can't imagine that it wouldn't appear elsewhere. I'm also not entirely clear on whether it is a completely new game or an expanded port of the 3DS game, but it appears to at least have some new content.
For those who have not played the 3DS game, Pushmo is an Intelligent Systems developed puzzle game where to push and pull blocks to make your way to a goal. And it is awesome.
Pushmo World will be hitting Japan June 19th, will cost 1,000 Yen, and will be 1GB in size.
Smart man! I didn't enjoy it as much as Pushmo overall but it was still well worth the purchase. I doubt there'll be any Crashmo-style stuff in the Wii U version because... Wii U version of Crashmo next year!