The aim of this short paper is to summarize main outcomes of the workshop, in order to guide future developments of research on Piano Key Weirs (PKW) towards most effective and integrated directions. The main research topics highlighted in this text came out from the 34 high-quality presentations given during the conference, as well as from the fruitful discussions in which the participants were actively involved. Many more truly innovative and promising ideas can be found throughout the other papers gathered in this proceedings book.