A first official report is now available. Reg: HB-ZTM, AS350 B2. Interestingly,it says it turned over to the left during landing. Only the pilot got killed, the passengers got away relatively unscathed. How does the pilot sitting on the right side end up getting killed and the rest walks away ?
https://www2.sust.admin.ch/pdfs/AV-berichte/HB-ZTM.pdf