I have the Note 4, and I follow it closely. As of now, there is NO permenant root, only temp. The Developer version is the only one to have perm root, because of its unlocked bootloader.
I wish the Note 4 had perm root, but I honestly don't see it happening. So it looks like I'm going to move to the new Nexus 6, or the Moto X Pure.
Well if you want a good camera then the Moto X Pure may be the way to go as I am seeing reviews putting it up there with the Galaxy 6 and iPhone 6. I doubt the Nexus will have a good camera as nexus devices have not been known for their cameras. But then again Motorola was not known for their cameras either and apparently put out a good camera. So it is possible that the Nexus 6P could do the same.