It's a foregone conclusion that Sasuke will have a rinnegan since he (the whole clan) is all about special eyes and ocular powers. However, I have no idea what's going to happen to Naruto. Since Kyuubi is now his friend and they pretty much trust each other, there's surely no way Naruto would keep the beast imprisoned within his body any longer than necessary. So, when all is over, Sasuke will be a hugely powerful muthafucka while Naruto will be a mere shadow of his former glory.