The application has been submitted!
Under the link: https://hansaviertel.berlin/unesco/antrag/
you will find all the documents prepared by the Supreme Authority for the Protection of Monuments/UNESCO World Heritage, which have been forwarded to the office of the Conference of Ministers of Culture for responsibility.
16 federal states have submitted about 32 tentative proposals. Over the next two years, all proposals will be evaluated and a vote cast for the German tentative list.
A really long procedure!