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GM News official link;
http://media.gm.com/servlet/GatewayServlet?target=http://image.emerald.gm.com/gmnews/viewpressreldetail.do?domain=2&docid=13824

Press Kit
http://media.gm.com/division/cadillac/sae/

Posting this because this car has a ton of awesome new technologies on it.
The PDF Link has detailed descriptions of the technologies mentioned in the web information.

A couple snipets.
Supercharged LS2 engine
Source: GM with Eaton

LS2 vs. LS7: The LS2 was developed as powerful yet refined engine. This makes it a perfect base architecture for this vehicle. The LS7 is a performance engine with an aggressive torque curve, making it less suited for the refined Cadillac character. To enhance the package, and truly place this vehicle in the performance arena, the supercharged LS2 maintains its base refinement with aggressive power.

The engine being used in the STS SAE 100 consists of a supercharged LS2 yielding 505 hp @ 5600 rpm and 520 lb.-ft. of torque @ 3600 rpm at 7 lb. of boost. General Motors has developed the integration of the Eaton M122 inner cooled supercharger to the LS2.

Engine type: OHV V-8; aluminum block and heads; 6-bolt main bearings, forged steel crank; powder metal connection rods; displacement 364 cubic inches / 6.0 liter; bore 4.00 in / 101.6 mm; stroke 3.62 in / 92 mm; compression ratio 9:1. Fuel delivery is provided by returnless, sequential port fuel injection.

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Two-piece carbon fiber with magnesium spokes
Source: Dymag (wheels) / Pirelli (tires)

It was time someone stopped believing that we didn’t need to reinvent the wheel.

This two-piece wheel is produced by means of a carbon fiber rim and a magnesium center fastened together with titanium bolts.

The goal was to make the lightest and strongest wheel available at a realistic price. This wheel has been in development for three years and has been developed with OE specifications as the benchmark. To achieve its goal of building the lightest and strongest wheel, Dyna Wheel has in turn developed its own proprietary resin, fiber and tooling.

The main advantage of reducing weight in a wheel is the reduction of unsprung weight. Reducing unsprung weight improves acceleration, braking efficiency, handling and fuel consumption. No other area of weight reduction yields near the overall performance gain that is that is achieved by reducing the mass of rotational parts (unsprung weight).

In the racing industry a factor of eight is often used when calculating the benefit of reducing unsprung mass against sprung mass. For example, a stock forged aluminum C5 wheel weighs 20 lbs. The MG/C wheel weighs 14 lbs. – a difference of six lbs. Six pounds of weight savings per wheel x 4 wheels = 24 lbs. x 8 = 192 lbs. By reducing 24 lbs. of unsprung mass, the equivalent in sprung mass would be 192 lbs.
 
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