SSB has no chance whatsoever to release this year, probably 2014 or 15. Didn't SSBB get a trailer/teaser during Nintendo's 2006 E3 conference? If right, then it will definately be showed at E3 this year.
Check out my Upcoming Wii U Games 2014 Thread
3DS Friend Code: 4553 - 9954 - 4854. Name - David