We sail on the Dream 6/6. If you check the NCl website you will see that the itinerary has already changed. The Dream is not going to Tallin. The engine problems are not being fixed, ports of call are being dropped from the itinerary.
I don't know what this will do to the transatlantic portion of your trip, but the Baltic portion is definitely changed.
Call Ncl now! See if they can give you more definite information.
I will post a review when we return from our Baltic Cruise on the Dream 6/6 to 6/18.
Norwegian Sky,May, 2002
Carnival Spirit,March, 2003
6/6 Norwegain Dream