Kenzan does not have any trophy support, so unless SEGA were to make some themselves for a game with little appeal outside of Japan (unlikely), Sony will not allow them to release the game.
They could bundle Kenzan with Yakuza: Dead Souls outside of Japan, but that also makes little sense. Either way, the game is around 30 USD to import new and I hear from numerous people that it is the worst in the series, so not that big of a deal.
But yeah, this is pretty awesome news! I really wanted this game, but I thought the original controls would scare far too many people away, but with the recent announcement of them changing the controls "If it were to come" I could not be happier! Well, if they added online co-op I would probably be happier, but I am not sure my heart could take that.
Maaaaaaaaaan, SEGA has such a brilliant upcoming lineup. I can barely get over Sonic Generations looking playable, let alone good (outside of some silly design choices, I guess). Outside of maybe ANARCHY REIGNS, I would say their upcoming games are better than most of the Dreamcast's life even. I am psyched!