important fights that should happen and an explanation --- would like to see at the very end
Sasuke vs Madara
Sasuke needs to have a fight and to SOLO Madara because not only would it be epic as shit, he would avenge his clan which was hinted a few chapters ago
Also, Sasuke looks like shit compared to Naruto now and if he is capable of defeating Madara, it will at least even the tables when going against Naruto + Kishi usually has a moral to each fight outcome
http://www.mangahere.com/manga/naruto/v60/c592/12.html Kabuto + edo tensei (aburame clan edo tensei'd guy) + Kakashi and whoever else vs Tobi (Obito/Izuna if theory happens to be true later on)
Orochimaru knows a lot about Madara and Tobi, to the point even Tobi doesn't know the extent of information Orochimaru has gathered on them
Orochimaru implanted Hashirama clone on Danzo, possibly using information he and Kabuto gathered regarding Madara in his "golden" years (having Madara merged with Hashirama cells)
Kabuto will turn good as a result of Itachi's Izanami when he wakes up from it (no way he won't be able to find his "true" self before the manga ends, stupid and boring to leave him mind trapped if series is over)
The aburame clan who was edo tensei'd has a crazy powerful technique which will melt Tobi's zetsu limbs
Sasuke vs Naruto
Because Sasuke (either himself or under possession) and Naruto have been rivals basically the entire series
Sasuke vs Orochimaru
Orochimaru should be the final villain as he was the main one in the Naruto series + no one expects him to be but the fact that he is still around and he knows everything (so far) about Obito/Izuna and Madara that he is planning something even more sinister.
With no interest in the war, he obvious has something more invested, possibly the revival of the original sage of six paths or a rebirth of one (him/sasuke's body)
Gedo Mazo / Ten Tails vs Naruto + whoever else
No point in mentioning some detail about ten tails if he's not going to be summoned. Hyped up already, Kishi has to show him.
-- but his form won't be "perfect" as he may not have 8 and 9 tails, if he DOES happen to get both, killer bee will die, naruto will be weaker but he will live b/c of uzumaki bloodline
however, the other half will always remain with minato in the death god belly
Naruto + Sasuke vs Orochimaru (return of his arms) + edo tensei'd 1st, 2nd, 3rd, 4th hokage w/ remaining kyuubi chakra
Naruto always said he wanted to surpass all previous hokages, nothing says surpassing all previous hokages than actually beating them + makes a full circle back to the beginning of the series
ALSO
It is highly possible Naruto and Sasuke will die somehow otherwise the conversation between Naruto and Sasuke would be pointless but the series would suck if they both died so they will probably come back to life or die in some metaphorical sense.
the supposed "fake" theory of Tobi actually being Izuna could still hold true, Rinnegan can still revive everyone legitly, there must be a downside to reverse edo tensei'd Madara as he was expecting a full legit resurrection.
+ the entire uchiha clan can still be resurrected through Rinnegan although that would be hella boring.
Tobi is not 100% on Madara's side as he wasn't resurrected earlier when he most likely could have been.