Some interesting observations.

LN-RKN seems to be making a full rotation, in addition to the launch from CPH it has served ARN and OSL. It does only seem to be used towards EWR. Unfortunately this makes seeing the new cabin a gamble, I'm confident it would have been more interesting for SK financially as well if there was a fixed route, more people would be likely to pay a C-fare.

http://www.flightradar24.com/data/airplanes/ln-rkn/

LN-RKH has made it to Zurich.

http://www.flightradar24.com/data/airplanes/ln-rkh/