With the price point as high as it is, I think the new GTR is going to have an aftermarket more along the line of the NSX. However, time will tell. I'm sure there will be an aftermarket but I doubt we'll be seeing TYC taillights or bodykits for it.
"The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace." - Automobile Magazine