during bees fight with kisame bees chakara was sucked up by the samehada and he reverted to cloak form.I might be missing something because I for one never seen B in a cloak form. And if I am "wrong" and it is not a serk stage then how did Naruto completely loose himself in that stage? Just in case the meaning of being serk means you have no control over yourself. In the right state of mind would you think Naruto would have hit Sakura? And B turns into Beast Mode. Serk and Beast are completely different.You must be registered for see images
The healing still applies, the only thing about it is currently the Kyuubi has no chakra left to fight and must gather chakra first... also he usually heals from small injuries over night. Something major that makes him end up in the hospital will take a few days if anything.Again the cloak actually harmed Naruto it had no healing trait. His skin actually dissolved in the mass of Chakra. If it kept up it could have killed Naruto according to Tsunade.