I have the 4.2 update installed on my ATV1200 but have a few issues with airplay.
With airplay built into XBMC ( gotham) it will show photos, but videos no longer play.
If i also install the Airreceiver app from the play store, I can get mirroring to work (which is good!) but if I try and play a video, it says 'can't play video format' almost like it doesn't have the codec for it?
Worked fine on the previous linux XBMC build I was using.
Has anyone else been using airplay at all?