Oh, Fatal Inertia. Once announced as a PlayStation 3 exclusive launch title by Koei, the Unreal Engine 3-powered racer eventually went multi-platform and released on Xbox 360 first, while the company struggled to get the PS3 version up to speed. The recent completion of Unreal Tournament III on PS3 means studios should have an easier time developing on Sony's hardware with Epic Games' engine, but that doesn't help the dozens and dozens of companies who have been attempting to make it work now.
Koei recently issues an updated release schedule to the media, with Fatal Inertia conspicuously absent from the list. When asked, the publisher said there was no formal release date for the futuristic racer, but they expected the PS3 version to arrive sometime in Spring 2008. There's no word on if the PS3 version will include additional content, but given the delays have been technical issues, we wouldn't rule it out.
You can get a taste of the game right now, however, by logging into Xbox Live and downloading the demo.