Despite completely dropping off the radar for more than a few months, Polyphony Digital lead producer Kazunori Yamauchi has confirmed that Gran Turismo PSP, tentatively titled GT 4: Mobile, is still under development.

While a target release date is not set in stone, Yamauchi says that we can “probably” expect the game sometime after Gran Turismo 5 releases on PlayStation 3.

We are working on the PSP version, and we will get around to it. eventually

With that statement in mind, I’m betting on a mid, maybe even late 2009 release. Looks like GT 4: Mobile is sitting on the backburner right now, and rightfully so, as GT5 is going to be a major release for Polyphony. Gotta get that out first!

Gran Turismo producer re-confirms PSP version [GamePro]

Read more: Rumor: Gran Turismo 4 Mobile Canned, Gran Turismo Mobile Still Under Development, 2008 Release Unlikely, Gran Turismo 5 Might Not Arrive Until 2010, GT PSP Still Planned, Yamauchi Assures That Gran Turismo PSP Is Still Moving Forward, Still No Release Window, Yamauchi Outlines PSP GT Plans