I think we'll likely get the opening revealed some time in November of next year to January of next year, unless of course hidden characters are always in the opening again.
Also, I miss the Smash 64 ending of the intro where they showed the hidden characters at the end.
They should do that in every smash game, except with epic highlights of them as well!
Seriously though, I still watch Melee's intro every time. Seeing that bomb-omb go off after we saw glimpses of some epic Nintendo history is way more epic than freaking watching a thousand shots of Meta Knight's ship after a bunch of random shots of various characters.