I have just received a press release from NCL Continental Europe (in German), in which NCL confirms that two ships will be deployed in Europe next summer.
"Norwegian Dream" will return to Northern Europe and the Baltic with her popular 12-night cruises including a spectacular daytime passage of the Kiel Canal, while "Norwegian Jewel" will offer Western Mediterranean cruises from Barcelona.
Strangely, NCL Miami has not yet issued a press release on this, but I assume this will follow, very soon.