After extracting himself from a jam, the flat one may get some additional definition.
Intelligent Systems has been working on a Paper Mario title for the Wii U and the game is in testing according to several sources close to Nintendo.
It isn’t immediately clear if the title is a remake of an existing title or a brand new game. Intelligent Systems was rumored to be hiring staff last spring and mentioning a new Paper Mario game was in development. The timeline matches the time the Japanese version of Fire Emblem Fates would be wrapping development.
The project is definitely slated to be a Wii U game, and other platforms are not being talked about as far as we know.