Ubisoft has confirmed they will be hosting “an invitation-only press conference at the Los Angeles Theater at 3 p.m. PDT, June 4″. This press conference will feature:
…demonstrations and trailers of Ubisoft’s upcoming lineup of franchise hits, including games for the new Nintendo Wii U, as well as digital titles, special guests and surprise announcements.
There will also be playable versions of Assassin’s Creed 3 and Rayman Legends on the show floor. It’s not explicitly stated if the Wii U versions of the games will be there, but I’d be surprised if that wasn’t the case.