I read for the caseless round by HK in a greek magazine about defense technologies several years ago,is this now on production?
No. The G11 was one of the victims of the German Reunification and the end of the Cold War. Some were used on trials by Bundeswehr units by 1989-90(IIRC), but the project was ended in the early 90's.
These disadvantages Thiel mentioned are serious,so the idea abandonded.but in future we may see such ammos,you never know.