Being kept very hush hush, seems the setup changed from what it was last time. It's twin turbo on a something engine, likely 2.8+, and something like 900 wheel or 1300 crank horsepower. PPG 5 speed dog box also apparently.
Some discussion going on about it at Antilag. I doubt we'll get too many details sadly
Car was built by Anthony Scali, previously famous for working at Xspeed (now defunct). Car was around years ago 2004-2006 but has changed engine setups at least a couple of times.