Unfortunately, i don't think minato will come back, he appeared to naruto to restore the seal and i think that was it.
Naruto will train, kishimoto said so himself in one of his interviews.
I personally think that all those mysteries around the frog's seal that jiraiya was guarding etc. etc. must end, naruto must know that, he is about to enter a war where the capture of the nine-tails and with that naruto's dead is one of the purposes.
So hopefully all those mysteries will be reavealed and i think tsunade might have something to say about naruto's bloodline ( if she lives ).
So for now i will say that naruto will train with the frogs, they are the ones whom make more sense actually, they are the most knowledgeable in minato's actions and jiraiya's too.
And i actually don't know how all this thing of controlling the bijuuss stuff works, but i think killerbee knows how to control his bijuu and that's it, i think he doesn't know a thing about kyuubi and how is it or it's personality ...
So all naruto needs right now in matter of kyuubi is people who actually know concrete information about the kyuubi, like specifications about the seal minato did, about the separation of the chakras, the advantages naruto can take out of that, how to do it , what minato really meant with special power to fight madara (because honestly naruto can have all the legendary unlimited kyuubi's chakra, but if he doesn't know shit what to do with it, to use it or to make it special it will be worthless), and that information killerbee don't have any clue at all.
Plus i am a little anxious to see how he is going to mix the sage mode chakra with the kyuubi, idk why but seeing natural chakra, sounds so pure, one must be connected with nature and on the other hand, bamm kyuubis' chakra, evil, burning, will of its own, terrifying, is like watching two totally opposite things, so i am really interested how they will mix that.