2011 Infiniti M sedan revealed at Pepple Beach

Infiniti revealed the 2011 M sedan Friday night with a virtual introduction at the Pebble Beach Concours d'Elegance.

The third generation of the luxury liner has a long hood, flared fenders that channel the Essence concept and a coupe-like roofline. It goes on sale in the spring of next year.

It will come in two versions. The M56 will get a 5.6-liter V8 making more than 400 horsepower--30 percent better than the current model--but fuel economy is still improved about 10 percent. The M37 will get a 3.7-liter V6.

The new M sedan will measure about an inch wider and half an inch lower than the current car, while maintaining the same length. This is meant to give it a sportier stance, said Infiniti design Vice President Shiro Nakamura. Also look for 20-inch wheels.

A blind-spot intervention technology will also be available. It pulls the car back into its lane if the driver tries to change lanes into another car.

Infiniti projected the image of the new M sedan onto a foam block using virtual video mapping. The live reveal is in December in Los Angeles.

By Greg Migliore