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The official engine details (supposedly):

The all-wheel-drive 2009 Nissan GT-R will be powered by a 3.8-liter twinturbo V6 engine churning out 473 horsepower with capabilities of 434 ft-lb of torque. Driving on a rear-mounted transaxle, the car will only be available with a GR6 dual-clutch six-speed automatic transmission. Nissan will give the driver use the same leather-wrapped aluminum paddle shifters currently used on the G35, according to Edmunds. The massive engine is alleged to propel the GT-R from zero to 60 mph in 3.5 seconds, with a quarter-mile time of 11.7 seconds. If accurate, that would put the car's weight at about 3075 lbs., thus having a power-to-weight ration of .154 (339.5 bhp per tonne). Base price of the Nissan GT-R is expected to be under $80,000, which should make it a prime target for stealing away potential Porsche 911 Turbo buyers.