Speaking of publishers, the original release was published in Japan by Marvelous Interactive, but since the Director's Cut never came out over there, there seems to be no ties between Marvelous and the Director's Cut, and that's the one coming to PC, maybe Rising Star might retain the rights over there as well?
That remains to be seen. This could be another Capcom like scenario, where Marvelous hold the rights but don't intend to release the game. You'd be surprised at how many games Capcom JP have had rights to over the years simply so the games wouldn't be sold =/.
Also, I've just looked this up on Amazon JP, and they themselves are selling the UK import of the Directors Cut. Amazon tend to leave the selling of imports to Market Place users. It's not often you see them doing it themselves.