Found this on GameFAQs:
"My friend is a staff coordinator for Nintendo @ E3. He said he got some heads up on what they're going to show at E3.
Smash Bros. Wii U and 3DS--They're going to reveal the entire roster. They didn't tell him it all is, though. He said they'll also show off a few alternate costumes such as Dr. Mario, Zora Link, etc.
Zelda U he said is a first person game. You're still Link, but the screen on the gamepad is a top-down view third person view. Obviously, the game will primarily be played on the TV, and the third person view will be used for certain puzzles.
Hyrule Warriors will come out at the end of summer. They're going to show a more polished version of the game that shows Zelda fighting alongside Link.
That's pretty much all he had for me. I asked about Miyamoto's IP, but he said they're keeping it very under wraps."
Source:
http://www.gamefaqs.com/boards/631516-wii-u/69242299
Take this with a grain of salt.