Its only a hunch. They will drop DLC its just a guess of who will be included. the guys i mentioned were in the last game, no reason why they can't be in this one..... unless of course if EA wanted to make some more money by charging for them.
anyways the 50% of the roster I care about i've never been able to use in a game i care about before, plus i can't wait to try out this engine. If its as good as it seems, every fight no matter who is fighting should be an engrossing experience.