They already showed a lot I wonder what else they can show for this game. Maybe more characters?
The big things left to show are characters and that green blurry mode which everyone suspects is a big single player mode.Those two alone can easily last 20 minutes.
Other than that, there is always more modes, items, assist trophies they can show.Oh, and online.They still need to speak about that and big changes could come to it.
And I mean, there is always the off chance that Sakurai is going to show something big that no one expects.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.