It will take a long long time till the germans publish an initial report.
The last updates on the Bulletin section of their website was from March 20 and included the accidents till the end of January.
They are not the quickest in these kind of things.
Bundesstelle für Flugunfalluntersuchung - Thema 1 (german)
Bundesstelle für Flugunfalluntersuchung - Interim Reports (english)