From a post on corvetteforum.com:
It will be powered by a next-generation Northstar engine, a 4.6-liter, 32-valve V-8 developing 315 horsepower and 310 foot-pounds of torque (current Northstar V-8s develop 275 to 300 h.p. and 295 to 300 foot-pounds of torque) and claiming a zero- to 60-mph acceleration of less than 6 seconds.
The V-8 will be offered with a 5-speed automatic transmission and a clutchless manual.