Honoka is pretty popular. She might show up.

Kasumi would be a legacy character for sure, if they're trying to get classic characters from other series. There's already Yoshi and Raven, but she's a different kind of ninja. If anything her acrobatic style might be too much like lots of the other acrobatic characters already in Tekken.

Kokoro or Hitomi would be interesting, as there aren't characters exactly like them in Tekken. The closest character I can think of with Hitomi's hard-style karate is Paul Phoenix. As for Kokoro, it's pretty different, but Leo might be the closest thing.

If it is DOA, and it is a guy, I wonder what the reaction would be to Brad Wong? He's the closest thing DOA has to Lei Wulong. I think it'd piss people off, personally, but who knows.