Though not sure will the Ducks answer the call on this...
Playing in Switzerland is a strong possibilty too...I would say it's 50-50 with Finland.
I believe Jokerit owner (the Helsinki organizers) have Ducks on their list...it's only logical one...maybe Capitals too there are no Finns but russian fans would come because of the near/easy travelling.
This is a very bad idea for the Ducks. Starting in Europe helped with a very slow start last time, and I don't see why it would be any different this time. The jet lag coming back is horrible. It takes me a week to recover, and while the players are young and in great health, it still has an impact upon them.
Playing in Europe at the start of the season is another dumb idea brought to us by GB, and we ought to reject it. However, I suspect that since the team is "invited" it really has little opportunity to reject the idea.