I disagree. In that situation, I believe the best thing to do would be to gather the data of each version of the character. Of course, with the amount of games Sonic and Mario have this would take some time, but some people are dedicated to this type of thing. It's a fun way to kill time, that's for sure.
As for why anyone would get their hopes up guessing an update, it's simple. The feeling of calling an update beforehand is pretty sweet, I've called quite a few since Brawl and it's just as exciting for me this time around. When I get a guess wrong, I don't disappoint myself. In fact, I would actually prefer Sakurai to be the troll he is. After all, what fun would it be if he was too predictable?
Definitely loving the visual effects in the game, little things like that tend to have a big effect on the overall feel of the game play.