It was all a misunderstanding, the whole thing came from a simple email some JP dude sent to SE regarding the PS3 version of SO4. He got a canned reply of "to be determined" which means "we are not working on a PS3 version now" basically.
I dunno why it's so hard to understand, tri-Ace is a small studio. Even if SE ports the game, I really doubt tri-Ace themselves are going to handle it. And if tri-Ace isn't going to handle it, then I feel pity for whatever team ends up porting the game (tri-Ace games don't even run well on BC, I shudder to think what it'd be like to have the game running on a completely different system). SE would rather have tri-Ace working on a new game, than porting an old game. Besides it's not like SO4 is going to bomb, SO is a good seller WW. Also, Shinji Hashimoto answer to the "will SO4 get ported to PS3?" question pretty much killed any possibility that SE will work on a possible port in foreseeable future.
If SE is smart... they bundle the FF13 demo with SO4. that way SO4 will sell even more and they wouldn't have to waste resources in a port IF SO4 ends up bombing (which I really doubt.) This is all hypothetical, though. Don't start quoting me and shit.