This, and the red one before it, are at least two years old. Do a search on Google and you'll find similar info dated from 1999 to 2002, all identical. This is an unofficial Photoshopped version, made by someone who heard from someone who knows someone.... It's not a real image.
This is from 2000, before the G35 was considered for the US market. It's official, from the Nissan Japan website, and was a 3D rendering, but it never even made it to clay. Once Nissan decided to revise the Fairlady Z, they needed something to help reduce the costs. Thus the G35, which was derived from the bog-standard Skyline (which is just a RWD, inline-6, moderate-power coupe). But Nissan also wanted to move the Skyline upmarket, closer to Porsche than Mits's EVO. That couldn't be done with the then-current G35/Skyline platform...at least not cheaply. So a new platform was created: The GT-R. No "Skyline" name, just "GT-R". It could be a V8, a twin-turbo V6, hybrid...anything. None of that's even close to settled yet. Only the basic design, and electronically controlled AWD. So while Japan calls the G35 a Skyline (you can even see it on the Japanese website), it's nothing like the Skyline of GT2 fame.
Sorry to burst people's bubbles, but the grey-and-silver beast is close to what we're getting. Proof? It's from 2002, and it's been on tour to various shows. I, um, very much like it though.