When Scribblenauts hit the DS it opened a whole new avenue of what could be in gaming. So, it should come as no surprise that Nintendo wants to launch the Wii U with such a unique franchise.
5th Cell showed that there will be same screen multiplayer with Wii and the Wii U Gamepad. The players will also be allowed to share their creations by simply naming them and then someone can type it and find it.
Here is the trailer:
Another interesting thing is the ability to fuse objects like a saddle and skulls that peform as wheels so that the Scribblenauts character can ride it. Nintendo did confirm that this will be a Wii U launch window game, but nothing for sure right now.
Here is a Developer interview too: