Sony came through with a holiday surprise of its own for the proud, the few. the PlayStation 3 owners: a demo of its next big racing sim, Gran Turismo HD Concept. Since the "HD" downloadable content approach has been scrapped, fans speculate that it's actually a first look at the technology that will power Gran Turismo 5. Whatever it is, it includes a Ferrari and cars from Infiniti, Lotus, Mitsubishi, Nissan and Suzuki. There are even leaderboards and downloadable replays. And it's only available for a limited time...
