Found 4th Aug 2015
Previously available on US PS store, now available in UK and presumably most of EU. if you have the PS3 version of the game, you get the PS4 version for half price. Even better if you've been a PS Plus member for a few months, you may have picked the PS3 version up for free, and you still qualify for the offer. Digital only however, won't work if you have the disc version.