Hi Michipons,
I did AB assessment about 3 years ago.We had about 4 pilots (out of 12 that had beed invited that time) that hardly spoke any german except "guten tag".
(Think two off them had TR on 737)
They told me that their tests were performed in english.So,not sure if it was exception or not.I failed the interview because according to them
my "english" is not good enough. (Apparently I passed my UK FATPL
flight training and flight instructor course just with pure luck......
)
Overall they have been quite nice and polite.
DME11.2 got some good links there.
Sorry not to have any more updated infos.
Good luck to you!!!