Nintendo has confirmed on Twitter that it will show Wii U titles in a pre-E3 Nintendo Direct.
In a Nintendo Direct before E3, the new 3D Mario, Mario Kart, and Super Smash Bros. will be shown, along with other Wii U games.
This Nintendo Direct will mark the start of Nintendo's Electronic Entertainment Expo showing, which is notable since Nintendo is forgoing a traditional press conference.
No specific date was given other than before E3.