This is just a prediction. I beleive that Naruto and Sauske will joing forces to fight Madara/Tobi/??? or whoever he is. We know that Madara plans to let Kabuto take Sauske after he fulfills his purpose with the Akatsuki and Sauske will find out somehow and then turn on him and will need the help of Naruto to defeat him because neither one of them is strong enough to take on Madara one on one. But after the fight they will resume to Sauske being a missing nin and Naruto chasing after him.