Jordan de Souza, late of the COC and Tapestry, continues to make news. Having recently joined the Komische Oper Berlin as Studienleiter, he will, from the 2017/18 season, be the Kapellmeister (but not GMD). I think (my knowledge of German musical semantics being imperfect) that this represents a step up from Assistant Conductor to Chief Conductor with a policy role but stops short of implying overall control of musical policy. Apparently the Komische is still looking for a GMD. For those who might be able to wring more out of it than I, here is the article from Musik Heute (auf Deutsch).
ETA: A kind German correspondent provided further information on the semantics of “Kapellmeister” as it generally applies in German houses (i.e. may not be 100% correct for the specific case of the Komische). So, Kapellmeister is basically the second resident conductor of an opera orchestra after the GMD, without (usually) being in any real sense an “assistant”to the GMD though possibly a “deputy”. Generally the Kapellmeister takes on a number of repertoire productions per season and perhaps also new productions and/or concerts.