I think they'll start revealing new stuff in 3 weeks, there's 8 characters left unannounced and they could announce 3 every week (2 in one)
They would go in order of how you unlock them. First Ness, Falco and Wario. Then Dark Pit, Doctor Mario and R.O.B. Then Game & Watch, Ganondorf and Bowser Junior and finally Duck Hunt and Jigglypuff.
Then the following week we'd have a second smash direct where Tower of smash along with a few other wii u modes and features will be revealed along with one of the newcomers, Maybe chorus kids cause they rep a new series or Ridley or Mewtwo cause HYPE!!!
With the month leading up to release the rest of them will be announced.
Here's basically a summary of what could happen
October 10th - Dark Pit, Doctor Mario and R.O.B
October 17th - Game & Watch, Ganondorf and Bowser Jr
October 24th - Duck Hunt and Jigglypuff
October 31st - Smash Direct with Tower of Smash and a Newcomer (Ridley)
November 7th - Another Newcomer (Dixie/Impa)
November 14th - Another (Dixie/Impa)
November 21st - Another on day of release (Mewtwo)
And in the same way the newcomers had the little red newcomer banner on the site, they'd have one that says transferable
This may seem like a lot in the span of a few weeks but y'know, Hype! And since all the characters are all avalible from the start there's no real point in trying to keep them secret
Also we'd be missing a character but they could always be revealed later
I know I shouldn't try to predict Sakurai but I just can't help myself