Tecmo on twitter says digital version of DOA5U coming on EU PSN in "next few weeks." I've asked if that goes for Core Fighters as well, but no reply. I'm assuming it does.
I'm gonna have to get the retail version I suppose.
I know I should support the game by buying retail but I only play as the Ninja's. So Core Fighters would have been fine for me. I would have dropped my spare change in my PSN wallet on Momiji and have been happy. I've already blasted through Story Mode on vanilla DOA5.