The Training
Jiraiya has told Naruto about this, and he's already trained to train him. When he warned Naruto not to use 'that jutsu', what was he talking about? What training did he embark Naruto upon?
Tampering with the Shishou Seal
Jiraiya told Naruto, between Part I and Part II, that the Nine-Tails is a dangerous power that threatens to take control of him. He told him that a jinchuuriki must master the beast inside them, instead of letting it master them.
We know that Jiraiya had the sealing toad twist the shishou seal a little, Naruto lost control and went four-tails, nearly killing Jiraiya. Let's ask the question – why was Jiraiya tampering with the shishou seal? What does it do? What's the purpose of the shishou seal?
Shishou means elephant. That said, read this:
http://www.onemanga.com/Naruto/91/12/
"It's set up so some chakra of the Nine-Tails slips out from between the elephant seals and combines with the kid's chakra…"
Jiraiya was trying to speed up the process by which the Nine-Tails' chakra flows into Naruto's body, to 'train' him towards handling the final step – mastering the Nine-Tails completely.
Naruto, I know you know but… Don't use that jutsu
I know that part of this theory doesn't quite sound strong, and that's the implication Jiraiya made that Naruto could use that jutsu if he wanted. That's the only reason to believe that these two 'that jutsu' are different.
Jiraiya has told Naruto about what he might be able to do with the Nine-Tails, or at least hinted at it. When he tampered with the shishou seal, he had most likely told Naruto that he was going to train him to better control the Nine-Tails. He could very well have introduced it as a jutsu to get his attention.
I maintain that when Jiraiya said "Don't use that jutsu" he was talking about intentionally drawing on the Nine-Tails. Naruto is subconsciously holding the Nine-Tails back all the time, and it's consciously letting the Nine-Tails through – something which I suspect Jiraiya has helped him learn how to do – that he's banned from doing.
Naruto knows how to switch the Nine-Tails on now, but 'switching it on' is the first 'that jutsu' that Jiraiya banned. The 'that jutsu' Jiraiya mentioned much later to the sealing toad is the final goal of that training – mastering the Nine-Tails entirely.
The future for Naruto
With Akatsuki after Naruto, his future's very uncertain. Will he get caught? That's not the place of this thread to guess. But what we do know, or should strongly suspect, is that he's eventually going to open the lock and release the seal on the Nine-Tails. That's what keys are for, and that's why we see into Naruto's mind and see the Nine-Tails physically behind bars. It's foreshadowing the day Naruto steps into his mind intentionally and opens the door.
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