Naruto has chakra of all 9 beasts!
I believe Naruto has chakra of all 9 tailed beasts and he will use them soon for a new power.
For starters, he obviously has the chakra of the 9 tailed beast Kurama.
He has the chakra of 2-7tails as well, through fistbump as seen here:
He has the chakra of the 8 tails, Gyuki.
In the fight vs Kurama, where Bee and the 8 tails helped out, Kurama absorbed a tentacle.
If he still doesnt have it somehow, than the 8 tails is still present in the current battle, for a fist bump.
The 1tail Shukaku hated the 9 tails Kurama. I wouldnt be surprised if Kurama somehow took some of his chakra in a battle between them. Some other possibility that Naruto has gained some through Gaara or battles with Gaara. Kishi could easily pull some plot no jutsu out of the hat .
This picture enforces Naruto having all 9 beasts their chakra as well, cause we see 9 tomoes.