Another note about the Miiverse pics so far. When combined with the videos and other pictures that may have been released (through Facebook, for example), we have a fairly even amount of information about each character.
We know the most about Mario, followed by all the newcomers (due to their character specific trailers). Samus is next. The rest of the characters have less info but are mostly around the same level (Sonic has a little more due to his trailer, for example, Bowser's section of the Developer Direct gave us a little more info, etc.).
The two characters we know the least about are Olimar and then Dedede. We've barely seen Olimar do anything aside from stand, jump or walk (with or without Pikmin following him).
Considering the size of each character's moveset, Sakurai could easily make an additional year's worth of updates without exhausting the movesets of the previously revealed characters. Many of them wouldn't be very interesting though (throws are boring for many characters). And of course, the full roster is going to be at least 50% bigger, so he'd really not even get through half of that.
Given that and the amount of information about stages, items, trophies, (stickers?) and game modes he could reveal over the next 6 months or so without much effort and without spoiling everything, it is a bit annoying to get total filler like tonight's. I'd rather get even a veteran's basically unchanged, but unseen move as filler.
Hopefully at some point we get music updates... I guess Miiverse isn't suited for that, unless they want to put it up on YouTube, but they could put it on the website. I'd really like to hear some Mega Man stage music...