|Wave, The (Die Welle)||R2UK|
This is a Region 4 DVD.
There is a Region 2 UK version which boasts the following features and extras:
I haven't been able to find any comment on the quality of the extras but for the English speaking audience that would seem to be the version to get if you really love the film.
My German isn't good but I believe the release in Region 2 Germany has the following features and extras: German Dolby Digital 5.1 and DTS 5.1, German Subtitles for the Hard of Hearing.