IIRC there're many reliable sources claiming Ninty will have a very marginal E3 presence this year... and what little they'l be presentin' is gonna be behind closed doors, as usual. Havin' an official Smash 4 trailer would certainly be nice considerin' there probably ain't gonna be much else.
I wonder what new characters, if any, will be presented in said trailer. Assuming these rumors are true (I hope they are Dx).
Well Nintendo pretty much said: Yarn Yoshi, 3D Mario, New Zelda, WWHD, Monolith Title, Mario Kart Wii U, and Smash 4 are all being shown. Plus most likely more. LIKE, whatever retro studios is working on. (Bet you it's SFWii U)