Nintendo revealed at this year's E3 that they would be working on a new Super Smash Bros. title for Wii U and thanks to a leaked document, we may have the name of this future title.
The document, a supposed fact sheet about the game, had the heading "Super Smash Bros. Universe" at the top. The document surfaced on internet message board, 4chan, and was found by 1Up.
During E3, Iwata stated that the game would also have some kind of functionality with the Nintendo 3DS. But nothing was mentioned about that on the document.