Gran Turismo 5 delayed in Japan, new date unknown

Sony
announced that the Japanese release of
Gran Turismo 5 has been delayed from its unspecified March date to an undecided future date, to be announced later. Sony apologized for the inconvenience, citing some kind of "circumstances" around the release date. No concrete information was provided about
what exactly caused this drastic move.
Things seemed to be looking up for
Gran Turismo 5 for a while. Sony announced a
March release for Japan and a tentative
summer release for North America, sent out a very popular
demo, and even revealed the North American
box art design. But this latest move suggests that Polyphony's latest racer may not be as close to the finish line as expected.
[Thanks, Copland and Niko]