I hope they announce a new mechanic for this game that we haven't seen in the previous ones!
Melee introduced an extra special move per character, hookshotting/grappling the stage for recovery, wave dashing (argh...), and aerial dodges in four directions.
Brawl had flying, weaker knock back damage for moves if used repetitively, and Final Smashes.
I wonder what SSB4 will get? I'm calling the tag-team mechanic like in Capcom vs. Marvel if it appears!