Incident/accident reports are published from the BFU, you can find their webpage at
BFU Bundesstelle für Flugunfalluntersuchung BFU - Homepage, you can switch to english there, click on publications, incident reports and you'll get a list of published reports. However the report to that incident is apparently not published yet.
It seems further that not all reports are published in english, probably only those where one participant of the incident is not german.