So, I booked ARN-HKG for travel in early October, and it turns out to be LN-RKP.
This is a result of the delay of the new A330E. However, according to this article, SAS promises that despite the A330E delay, "the route will be operated with a 330 aircraft. There won't be any difference to the passenger experience - all 330's are upgraded with the new cabin."
http://www.travelnews.se/artiklar/ny...irbus-forsenad