I believe the last thing they said on the subject (pre-Yoshida) before officially shelving the PS3 release was 'we've got it running fine, but we're holding off a bit so we don't have to keep patching the PS3 version as we add stuff'.
That said, however, I'm afraid Rydin's 'unless..' is untrue. Pre-shelving developer commentary made it clear the game was developed for the PC first as they gave progress updates on adapting the game for the PS3. Although some things were influenced by the PS3; for instance, removing tails from the early Roegadyn models; something about the PS3's memory not being up to it.