It's been nearly 24 hours since Apple pushed out 5.0.2 to Apple TV owners, and, at least at the time of this writing, it has still yet to post any details regarding the update. The ATV support page still shows 5.0.1 as the latest software.
But perhaps the changes in 5.0.2 were so minute that it didn't warrant any kind of changelog. After all, the folks at FireCore have already managed to update their Seas0nPass jailbreak utility to support the new firmware...