The context surrounding this direct, and the 2nd Pokemon direct are a fair bit different, but it's the closest analog that I know much about (I don't know much about specific game oriented directs sorry
). In that Pokemon direct if I'm not mistaken we saw the following:
-A review of the history of the Pokemon games. This took up almost half of the direct.
-A new service (The Pokemon Bank)
-Some more details regarding something already talked about (MegaEvolution)
-A small detail that was still kinda nice to know (getting to choose a 1st gen starter)
-3 new mega evolutions (The starters).
If Smash follows a similar pattern we are apt to see the following:
-A review of Smash history. Likely not as long as Smash has less history to talk about, but still probably a few minutes at least.
-A new feature or game mode (new adventure mode maybe?)
-More details about "directionality" of attacks.
-3 character confirmations (1 new 2 vet? 2 new 1 vet? who knows)
-A release date? (It was mentioned in the Pokemon direct but then again for that direct we already knew what it was)
Regardless, as I already mentioned, the context is quite a bit different so who knows? At any rate, this is where my expectations are at.
Max:
-2 new
-3 vets
-Directionality explained in detail
-Adventure mode explained in detail
-1 more mode revealed or hinted at.
-Release date
-Nontrivial Gameplay Footage.
Expect:
-1 new
-2 vets
-Directionality clarified somewhat
-Some mention of a game mode
-Release date
-Nontrivial Gameplay Footage
Minimum (No disappointment):
-1 new
-Directionality or Adventure mode clarified somewhat
Absolute Minimum (That could happen):
-1 new
As for who any of the revealed character(s) will be, I won't even hazard a guess. Big Mac really surprised me with when he was revealed, so I have no idea.