Officially mum as they seek government money. In the 2/3rds of Germany that can get cable, DT has been falling behind for years. Mike Fries of Liberty has aggressive plans to expand the cable footprint; LGI's expansion in England and Germany is the largest new wireline network building in Europe. City networks in Munich and Cologne are also upgrading rapidly.
DT is carefully not discussing their G.fast plans as they negotiate with the government for billions in subsidies for vectoring. The 20% of Germany without cable or DT upgrade plans has $4B in subsidies already allocated. DT wants more money, but doesn't want to build a robust network where they have a near-monopoly.