So I just thought about the reveal schedule.
Imagine the game releasing on November 2014. Sakurai might want to save some reveals as secrets until release. Let's say the game will have between 40 - 45 characters. Now, from October 2013 to November 2014 is 13 months of information. We have 16 characters revealed already. This month we had to reveals and I think that trend can be held until release. If that happened, we would have 42 revealed characters before release. But I guess we could have 3-5 months with just one reveal by Q1 next year. If that happened, we would have aproximatedly 37- 39 characters before release.
Next year is going to be interesting with Nintebdo release, since we don't really know much about WiiU and 3DS software so far, just like 4 Nintendo games on each console. That means we could have like 3 or more exclusive game reveals for each console for 2014.
Yoshi is going to appear next year in two games as the main character: Yoshi Yarn and Yoshi's Island. Plus he will appear in Mario Kart 8 and Mario Golf 3DS. And there might be another Mario game (Mario Strikers U?) and maybe DLC for 3D World including Yoshi as a character/power up. So my guess is that next year is going to be the year of Yoshi.
Now, with those things in mind, let's look at thepossible character reveals.
November:
Pokemon Trainer
Zelda
December:
Diddy Kong
Sonic
January:
Yoshi (because year of Yoshi)
February:
Captain Falco
March:
Wario (MK8 release?)
Ganondorf
April:
Ness
May:
Bayonetta (2 release?)
King Dededee
June:
Namco character (E3)
New character (E3)
July:
Marth
August:
Lucario (or Mewtwo) (Pokken release or something?)
Zero Suit Samus
September:
Falco
ROB
October:
Meta Knight (Kirby game release?)
New character (Nintendo direct)
November:
New character (smash specific direct)
Snake