The Ministry has published the study on September 4, 2018, see here.
The study deals with the question whether there are gaps in the current antitrust rules on unilateral conduct of dominant companies or companies with market power in the digital industry, and if yes, how to close these in Germany.  The study provides a comprehensive overview and excellent analysis of a very up-to-date discussion among antitrust lawyers and economists, as well as some interesting recommendations.  One focus is whether the already existing possibility for the authority in Germany to intervene even below the level of dominance should be expanded, for example in order to prevent the tipping of a digital market.   Silke Heinz is quoted on the study in the Global Competition Review, including on recommended changes to merger control rules, see here.