[yaluckyboy]

It was also mentioned that while Naruto's outside appearance was similar to his father, Minato Namikaze, his personallity and fighting style was much closer to his mother, Kushina. If this is true, then it could be assumed that Kushina would have a lot of experience to pass on to Naruto. Perhaps Kushina would be another of the few people who have learned the Rasengan and would have worked on it herself, allowing her to teach all sorts of new versions to Naruto.

Personally, I think that Kushina has been travelling the world, gathering information just like Jiraiya used to and would be returning to Konoha after hearing about all the things that are happening. And when she gets back, Kushina and Naruto have an initially awkwared introduction that later becomes very emotional.