While this isn't an issue for everybody, updating iOS firmwares is usually a good thing, but this means that those hoping to downgrade and Jailbreak iOS 8.4 are out of luck.
Currently there is no word on whether of not the Pangu team plans to release an iOS 8.4.1 Jailbreak, however with iOS 9 just around the corner, we're sure the team is saving its exploits.