Apple released iOS 5.0.2 Build 9B830 firmware for the Apple TV 2G and Apple TV 3G yesterday and it is also confirmed that it is safe for jailbreakers to update their Apple TV to the latest build.
Soon after the release of the latest build FireCore Team have updated Seas0nPass to support the latest firmware update.
Apple TV 2G users can jailbreak their Apple TV untethered using the latest version of Seas0nPass.No support for Apple TV 3G yet
If you want to know how to Jailbreak your Apple TV 2G then you can go ahead with the tutorial here.
The changes in iOS 5.0.2 firmware is still not known.
Direct download links for Seas0nPass for Windows & Mac OS X