He mentions in the interview that Capcom owns all rights to all of those old 'Clover' games, so really his potential involvement in any of those series is unlikely. In the Wii port of Okami, Clover's credits are removed entirely (which was a complicated issue, but still an extremely sucky thing to do). The only way Kamiya would have been able to do one of his old franchises again is if Capcom specifically contracted him to do it.

It's been a little while, but I don't think the Platinum remnants exactly left Capcom on good terms.