Board Thread:Naruto Discussions/@comment-25272137-20140806114740/@comment-24891350-20140813122248

A final fight between them has been hinted since the beginning of the Naruto series. So i'm pretty sure it will happen.

I think 3) is most likely. After Naruto beats Sasuke, he will convince him to return to the leaf village and Naruto will become Hokage.