There is a report now in a local paper that has the names of the pilot and of the owner of the helicopter (rather unusual in Germany to publish names, but obviously both are well known persons in their town).
According to this report, the helicopter was a Robinson 44 being ferried back to its home base (EDTY) from maintenance done at EDMA. Final cause of the crash was indeed a collision with power lines. Why the helicopter was flying so low is not known. Contrary to his usual practice the pilot had not maintained radio contact with flight information service on this flight. All that is known is that he had delayed his departure from EDMA due to bad weather (communicated using his iPad because he had left his cellphone in the car).
This is the newspaper article (german language) from "Heibronner Stimme":
Verunglückter Pilot ist 42-jähriger Bretzfelder - STIMME.de