Ev1n has posted in the Official EU Forum confirmation of a German Premium Destroyer is to be released. When asked by a player, Ev1n replied ” There will, but unfortunately not any time soon. it got delayed by research and materials gathering.”.
It’s unfortunate that we are getting a complete German Destroyer tech-tree but not a single Premium Ship to train a Commander. According to Ev1n, Wargaming could “do a variant clone of one of the tech-tree DDs, but we’d like to avoid that.”
At these last words could mean we are getting something unique/different, rather than a clone of an existing ship.
Source: WoWS EU Official Forum