now naruto can master version 1 & 2
with version 1 naruto coud use this state
Using his own chakra, Killer Bee can freely and quickly form a red demon cloak that surrounds his body. Once activated, his canine teeth and nails grow long and sharp. The cloak itself gives Killer Bee paws of chakra around his hands and horns on his head. He can also create an additional set of horns on his forearms to use for his Lariat attack.
He enters a three-tailed form during his fight with Taka; and one, four, seven, and eight-tailed forms at different points during his battle with Kisame. Kisame's Samehada is able to absorb up to six of these tails at a time. Like Naruto's first three tailed forms, these tails are transparent with bubbles of chakra forming on the surface. Other than an incremental increase in Killer Bee's strength and speed, there are no obvious differences between the number of tails.
edit Version 2
Killer Bee's version 2 form.
By tapping into the Eight-Tails' chakra reserves, Killer Bee can enter his "version 2" forms. As stated by Sabu, this is done by forming the chakra into a human shape. These transformations are meant to give him an edge in battle without completely releasing the Eight-Tails, as that would endanger anyone around him.
The version 2 chakra cloak is much darker than version 1 (similar to Naruto's four-tailed form and upwards). Hooves form around his feet, the horns on his head elongate, and a final "chin horn" resembling that of the Eight-Tails appears. While in this form Bee becomes more muscular, and if necessary can create chakra bones, such as a bull's skull, to increase the strength of his attacks.
When struck by Samehada, only the Eight-Tails' chakra is absorbed, so Killer Bee reverts to a version 1 form with the same number of tails. So far only the version 2 eight-tailed form has been seen, so it is unknown whether he can activate version 2 with fewer than eight tails.