And still no Naruto.
1. Kishi would like to compare Hashirma-Madara with Naruto-Sasuke.
Sasuke got grudge from other villager like Madara in the past.
Then after this war end, Naruto may become Hokage and Sasuke stay at the village but other people still have grudge to him. And Naruto have to use some incredible method to resolve that grudge(IDK how, haha) and it concludes that Naruto is the better Hokage than Hashirama he's all acceptance from other village too...happy ending.
(End with the back of Naruto's Hokage's cloak )
2. I think Obito will betray Madara in the end, because he was convinced from Kakashi.
3. At last, instead of making illusion to the whole world, Madara was lost in his own illusion world forever :P
4. About Orochimaru,..hmm. I don't know how to say, I thought Kishi change his mind about Orochimaru's charactor. :/
I think he will reveal that he did every thing for the world's peace but in the wrong way and now he believes in Sasuke & Naruto's way. RIP :P
(Oh, before he's gone to peace, he will say good bye to Tsunade personally and Jiraiya come to pickup him to the other world. hahaha)