Updated roster predictions. At this point my gut says 22 to 24 characters, with the corner slots being unlockables. I really do think the center slot is CaS, and that it appears once you start making customs. It really wouldn't make sense to leave an empty space in the middle when the clock is at the bottom, and I doubt they're leaving it for DLC since that usually goes at the extremes and not the center.
I guess I should also mention that Edge Master is relevant to the story, and could actually by a character in this game. If he's in he'd replace one of the corner characters in the high-count scenario.
Also, I don't think we'll get all those DLC characters, just that they'll probably draw from those. I really doubt we'll get guest DLC characters; guest CaS pieces would make more sense for that. Dark Souls and Gundam CaS DLC would be pretty awesome, and could actually happen since Bamco owns those licenses.
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