Nintendo has confirmed that they will be showing a trailer of the upcoming smash bros game in their Nintendo Direct E3 stream on June 11th. It is unknown whether they'll be showing both the Wii U and 3DS versions of the game or the Wii U version but it could very well be both versions of the game.

Source article
Smash Bros. Wii U trailer to be shown during Nintendo Direct E3 | VG247

Anyone looking forward to the trailer? I can't wait to see what will be revealed.