Well yeah, I suppose they really could finish the last update by december. But other that balance tweaks it would be great to see a couple of new characters. There are so many cool characters in daibanchou,I wonder why don't they added Zanma Gou or Kuga Kyoichirou, which are 10 times more valuable in storyline than Kinako and Erika.
As for kamui, I think it would be good to make playable non-cheap version of him, while boss version will remain only at the end of story mode. Indeed he is still incomplete, well he doesn't even have animation while standing.