i personally think that Naruto going to have a heart to heart with the 4th were ever he goes when the 9 tails takes over.
From that he probably going to slowly start to revert back to normal thought probably badly burned due to the charka that was being let loose.
The 4th probably wont teach him anything due to the only jutus that naruto doesn't know that was his is the thunder god tech,
we all could be wrong to and her could just rip the seal right off and not listen to his father and go nuts willingly and yamato going to have to do some wood justus and get him back to normal.
also to the one who was talking about the thunder god kuni that was just a different forge kuni with the seal need for the 4th to teleport to that spot,