Hey all, we're hard at work on an updated version of Seas0nPass that takes advantage of the Evasi0n jailbreak and plan to have this available soon.
Please keep in mind that while the FireCore plugins will work on Apple TV 5.1, a few minor adjustments (which are currently in progress) are needed to ensure things continue to run smoothly on Apple TV 5.2. Things like Plex and XBMC do not yet work on Apple TV 5.1 and later, and will likely require A LOT of work by their respective developers in order to be compatible.
I'll update this post as more information becomes available.
Update 2/12: We've got aTV Flash (black) and Seas0nPass pretty much ready for 5.2, and are just putting on a few finishing touches. We're expecting a release within the next few days. Note: We don't have any kind of ETA for 3rd party plugins such as Plex or XBMC.
Update 2/13: aTV Flash (black) 2.2 is now live! http://blog.firecore.com/post/43012930684/atv-flash-black-2-2