Long time lurker, first time poster here
On GTplanet, someone who owns an import shop in California said that the Japanese version of GT4 is coming out in February which means that the US version will be coming out 1 month later in March. It kinda makes sense since many sites say its for a Spring release. As for its long delay, its probly to get the online racing coding down good and solid and for extra time to license Ferrari (an F355 was in a photo shoot with other carss in Motegi) and Porsche. I doubt they'll get them in the game, but if they do, boy would that be a surprise.