After years of rumors and speculation, Nissan finally unveiled the successor to the 370Z. Although the Z Proto is a concept car and not a production model, it's an accurate preview of the next Z car, rumored to be called the 400Z. Now that the Z Proto is out in the open, performance car enthusiasts the world over are wondering whether Nissan will offer a Nismo version. And renderings of the 400Z Nismo are already flooding the internet.