Having slept and had time to simmer down, and by simmer down I mean let the Hype naturally flow and come to a solid resting point, I thought through my prior stance on Nintendo potentially lying about the content in this presentation.
Let's say I believe that Nintendo is telling the truth, now.
With that in mind, I don't think we'll see the leaked Mii Costumes (Mallow/Cacodemon) at all. It wouldn't make sense to show them right now. They'll probably be saved for future reveals where they are more fitting.
So, of the three leaks mentioned that benefit us thus far (The Mii Costume list given to PapaGenos, the Frogger Leak, and the Doomallow leak (lol), only the Frogger Leak can be really affected at this time (Confirmed or disconfirmed).
The only expectations that were lowered here are in regards to unrevealed characters.
3DSNinja
only mentioned new modes, and wouldn't be at fault for expecting something like that given the timeframe.