According to a rare English-language post on Twitter from GT creator Kazunori Yamauchi, (via GT Planet ) new content and features are on the way the Gran Turismo 5 in October.

The update, which Yamauchi refers to as GT5 Spec 2.0, is coming in the third week of October, with DLC following a week later.There is no information on the nature of the Spec 2.0 update or what the DLC will be.We were recently curious as to the silence around GT5 leading up to the release of Forza Motorsport 4. It now seems October will be an exciting month for fans of both franchises; good news for all.