SAS will start recruiting for the 737 with ARN base quite soon, numbers not known but I think they need more than a few.
The plan is also to employ non rated pilots in CPH for the CRJ as there are very few available with that rating.
Today there are pilots with OSL and CPH base flying out of ARN, I suppose they wanna get them back to their bases before recruiting to A320 in CPH or 737 in OSL.