It's been officially unveiled.
http://www.autoblog.com/2008/01/08/detroit-2008-2009-cadillac-cts-v-revealed-with-550-hp/550 horsepower, 550 ft-lbs from a supercharged 6.2L V8. Your choice of a six-speed auto or the six-speed manual borrowed from the Corvette ZR-1. Brembo six-piston brakes, etc.
The exterior is predictable--slightly more aggressive CTS lines with a hood bulge (that isn't just for show) and a mesh grill. The interior, though, may just be the best in the segment in my opinion.
The sport seats (14-way adjustable, and oh yeah, they're made by Recaro):
The dash (check out the high-res for the stitched-leather dash, the perforated alcantara seats and wheel, and the great combination of surfaces on the center console):
Full gallery here, including high-resolution:
http://www.autoblog.com/photos/detroit-2008-2009-cadillac-cts-v/556418/Now, we could argue all day as to whether this is supposed to compete with the C-Class AMG or the E-Class AMG, but either way, I think it's hard to deny that Caddy is bringing their A-Game.