A new 3D action Mario game for Wii U is in development at Super Mario Galaxy development team, EAD Tokyo, as well as a new Mario Kart game. Both titles will be shown in playable form at E3.
In addition to these, the first screenshots for Super Smash Bros. will be shown off at E3 as well, although Iwata didn’t share any new information about any of these games.
Additionally, Nintendo president, Satoru Iwata, revealed in a Nintendo Direct presentation today that a new party game for Wii U is being worked on by the team of developers that works on Mario Party.
Note: Screenshot from Super Mario Galaxy.