it was only a matter of time before the civic driving ricers got a legitimate skyline/GT-R instead of a Infinity G35 luxobarge. I'd say the GT-R's sales in the US are kinda critical to Nissan profiting on the who venture.
Now we just have to wait for american GT-R pundits to start popping up, fake R35 gear on ebay, a civic or accord that has an R35 "inspired" kit, some 4 foot skeletal asian chick draped all over one at "Hot Import Nights", lambo doors, scissor bonnets, neons and naaaws on an R35, and many many other wonderful side effects of giving the americans access to a japanese sports car.
On the upside, once some of the american manufacturers get stuck into the engine and car, expect some top notch performance parts and bolt on packages. Its a cut throat industry in the US, where reputation and quality are important... unlike the cheap chinese garbage in Australian "performance parts retailers".