Re: Kakashi's death?
Maybe Kakashi will be told by his father to never give up, and then he will remember Naruto saying I will never give up (or something similar), on one of the multiple occasions that Naruto says something like that.
A) Spur him back to life, but he is still very weak, (but he'll be healed eventually)
B) Allow him to come back to life for a short time, he goes and lays the smackdown on some of Pein's bodies before dying of exhaustion.
(Frankly, I hope it's A)