Dafa Poker on the iPoker network focusses on the Chinese market.
Pacific in general is good, as it does a lot of work in the east using the 888 brand, though I haven't played there in about 5+ years. My friends that still play there think it's pretty soft, but I don't believe there are any skins which focus solely on Asia.
As to the Hold'em in Japan thing, I lived there for 2 years, have traveled the poker circuit here in Asia quite a bit, and can say there is a small, underground movement towards Hold'em, but it is quite small and almost entirely situated in Tokyo. Because of the gambling restrictions in Japan, tournaments can't give cash prizes.
There are a few poker sites
that focus on the Japanese market however, but they are few and far between.