Amazon has begun pushing a software update to Kindle Fire owners, updating the tablet's software to version 6.2. The online shopping giant kept quiet about just what the update included however. Given this (lack of) information, the real story here is that the update breaks root. Additionally, the Fire is configured to update automatically over WiFi, and there isn't an immediately apparent way to stop it.
There is a bright side, however. After your Fire updates, regaining root access is not only possible, but easy, using SuperOneClick. For instructions, head over to the discussion on XDA Forums. It's worth mentioning that the update may wipe the Android Market app and custom keyboards, along with your root privileges. Even if this happens however, the apps you've downloaded from the Market are safe.
While automatic updates may be convenient for everyday consumers, I have no doubt that there will be a fix soon for those who want a bit more control over their devices.