I'm hoping they are only Arcade mode bosses and not actually playable characters. I really, really don't think we need any more characters of this style/type and I'm not just saying that because I favour guys like Zangief and Hakan.
We need more variety but I can't see us getting any more characters added to the AE if it's going to be a DLC. I hope we do, though, to compensate for two more Ryu characters and they better not add Charlie.