It seems like e3 will be all about Wii U to counter the coming PS4 and 720. We know we will see the reveal of
Super Mario Universe
Mario Kart U
Super Smash Brothers 4
Three big titles that we haven't seen and will see for the first time, the first two in playable form. That in itself makes for a pretty good e3. After that I think we will see/might see/hope to see:
Retro's game - Metroid?
X - more details, a name, release date?
Mystwalkers game - early details?
Wind Waker HD - fully playable
Zelda U - just a tease.
Wii Sports U - with a fall release?
Yarn Yoshi - playable, release date?
All new unique IP?
1 or 2 collaboration titles.
If that all was shown, that would be a lot of content to see. But I don't think it will stop there. I think we'll also see:
-Third party titles. COD MW4 and Destiny, possibly something else such as GTA or Final Fantasy. I think we'll see a few bombs, possibly with Nintendo doing the publishing themselves.
-A re-designed 3DS. A 3DS light or similar, that looks like Wii U and ads some features, possibly a second circle pad.
-Immediate Wii U price drop. Basic is done and $299 now gets you a deluxe, just in time for Pikmin 3 and Wii Fit U. Other bundles for fall anounced later.
