You can currently view a tentative floor plan of E3 2012 on MapYourShow. It’s unclear how much if this final, but I assume that most exhibitors/products listed on the site will be at the big expo in June.
Interestingly, there’s an entry on MapYourShow for a LucasArts MMO on Wii U. Could this be a sign of what the company has in store for the platform? Or is it just an error?
The current floor plan can be found here.