Ok get ready for some serious ass wooping.
We know that jutsu needs thr fox's chakra and the fox is building up his chakra again.
So we have a couple of options here for what that jutsu is,
1) wind-shurken bjuu dama
2) That jutsu is in fact a new type of cutting technique that cuts on a massive scale, ie moon etc..
Time to use imagination.
But finally the jutsu Jiraiya and Minato worked for so many years is finally coming.
Go get them boys!!! NarutoBase is behind you too!!