SCEA's director of hardware marketing, John Koller, has told VG247 that Gran Turismo 5's release timing across "all platforms" is still a matter of seeing "what makes the most sense."  Koller was responding to questions about the game's PS3 release date, speaking at GDC last week.  

"Ultimately, they are a developer who makes a lot of their own decisions," Koller said of Polyphony Digital."But we are looking at GT5 across all platforms, just to see what makes the most sense."  Koller fobbed off specifics on launch dates for further games in the series.  "Well GT5: Prologue's out," he joked.

"Seriously though, there is really nothing we can really say about it, other than it's a franchise we would like to continue.  "So, other than that, we don't really have any announcements regarding the game at this time."

Last December, SCEE's John Armstrong told a Spanish television program that we could expect Gran Turismo 5 by Christmas 2009.  Announcements related to both a PSP and PS3 version of GT5 are expected at E3.

http://www.vg247.com/2009/03/30/gdc-koller-gt5s-all-platforms-release-timing-will-depend-on-what-makes-the-most-sense/

all refers to more than 2 :P So we have the PSP and PS3 versions. maybe the Iphone will get a GT5 game..

GT5 on iPhone confirmed

 Yeah, it will if Apple didn't talk about competing with PSP.

So really, Sony will only release GT5 on consoles that don't compete with the PS3??

GT5:Wii edition!!

Perhaps a PS2 version? There still are enough ps2 owners floating around to make that a financial succes.

Well, this is getting old. It must be X360 version as Sony has already announced to became game publisher only.

You wish!

PS2 PSP and PS3. GT is sonys franchise right?

Maybe with "all platforms" he means the PS3, PSP and PSN.

SONY owns the Dev and the IP.... so....

PS3 & PSP???

I'm pretty sure the full GT5 will be too big for PSN so that rules that out.