From the August issue of Automotive Magazine page 58: (not exact)
"M1 Coupe Only. 2.2-liter direct-injection four cylinder engine, producing about 225 hp. Likely launch 2005."
"M roadster and M compact. The engine is an all-new 3.2-liter direct-injection in-line six, producing 300 hp. The roadster goes on sale in 2007; the not-for-U.S. M coupe compact has yet to be confirmed." (screwed in the US again)
"M3. Under the hood will lurk a new 4.5-liter direct-injection V-8, producing about 400 hp. Likely launch in 2006."
"M5. Powered by an all-new 5.0-liter V-10 engine, good for 500 hp. On sale in 2004."
The Skyline has been compared by many to the BMW M3 which I feel is about right, so a V-8 putting out 450 hp would be "Class leading" in the eye's of Ghosn. The thing to me is not "what" kind of engine the GT-R will have, but whether or not they will use the XVL platform and downgrade the GT-R the same way they did to all the other Skyline's?! Way to be original Nissan.