I have sound files posted from a 1980 production of The Rocky Horror Show in Essen, Germany:http://www.rockymusic.org/mp3scat/rhs-germany80/
Kind of a weird cast and not a very good cast album, but it's mostly in German. To be honest, the majority of German Rocky Horror Show productions are in English. (I have at least three others, I just didn't post sound files for them online since you can still buy them from places like Dress Circle
and Sound of Music
I also wouldn't be surprised if it's just the normal English version of RHPS, and would be equally unsurprised if they used English callbacks as well. A common complaint I've heard from people that visited Germany (who spoke German) was that everyone they met wanted to practice their English on them.