I guess it's time to speculate. Who are the six hidden characters? My guesses are:  
Takuma Sakazaki (Team Art of Fighting), Vice (Team Yagami), Jhun (Team Kim). 
 
Apparently, the ??? Team is Team K'. My guess for that team is: 
K', Kula, Maxima. (I'm hoping for this or even if it's Vanessa or Whip)

God, I hope this game is better then KoF12.

XII wasn't a bad game, it was just lacking in everything but the combat department. XIII is set to have more complete team rosters, more stages, etc.

" XII wasn't a bad game, it was just lacking in everything but the combat department. XIII is set to have more complete team rosters, more stages, etc. "

" @Napalm said:

" XII wasn't a bad game, it was just lacking in everything but the combat department. XIII is set to have more complete team rosters, more stages, etc. "

And hopefully a functional online from the start. "

@JJOR64 said:

"God, I hope this game is better then KoF12."

I really liked KOFXII while I was actually playing it. 
Everything else, from the design of the menus, to the number of modes, to the unworking online was just horrendous.

I really hope Yamazaki makes his way into one of these teams, imo he's far more important than K'.

 NO VANESSA NO BUY!!!!!!!!!
please everyone vote for Vanessa! make SNK be heard that us fans wants Vanessa!!!!!!!!