Well, most multi-platform games tend to be very close in terms of graphics these days. From what I recall with T6, the PS3 version would have looked exactly like the arcade and therefore would have overshadowed the 360 version.
Mostly because of MS ridiculous "no multi-platform game can look better on the PS3" policy, meaning that Namco has to dumb down the PS3 version even if it's running on practically the same hardware as the arcade.
Amazon UK is now listing the game for a PC release.
http://www.amazon.co.uk/Dead-Alive-5-PC-DVD/dp/B00844SPKQ/ref=sr_1_27?ie=UTF8&qid=1347447400&sr=8-27
Off course, it could simply be a mistake, but Amazon has hinted at releases before.