Since that patch in mid June, AirTunes fails to start.
This is not a big deal right now, but should be fixed for whenever ALSA is fully supported (right now, everything in RPi builds goes through omxplayer, which will fail because it can't decode the AirTunes codec used).
If this issue is still present with our latest builds please report XBMC related bugs to http://trac.xbmc.org because RPi support is now merged to XBMC officially.
Since that patch in mid June, AirTunes fails to start.
This is not a big deal right now, but should be fixed for whenever ALSA is fully supported (right now, everything in RPi builds goes through omxplayer, which will fail because it can't decode the AirTunes codec used).