Apple has done a lot of amazing things with iOS 6. It has made the upcoming iOS software update the world's most advanced mobile operating system. They have also cracked down on jailbreak exploits. An exploit which was used by jailbreak developers to root their devices has finally been patched by Apple.
Though this does not mean that there won't be an iOS 6 jailbreak. The bug in question here did not concern the average joe who uses a jailbroken device. As a matter of fact, this exploit is unusable for general public as it requires the use of an iOS Developer Account.
However this is likely to irk jailbreak developers. Using this bug they were able to get the proverbial foot in the door for creating a jailbreak of a new firmware. Without this bug they will have to discover an entirely new one. They're smart people, they'll figure it out. Thought the cat and mouse chase game between Apple and jailbreak developers just got a lot interesting.