Mainline SAS pilots don't like SAIL. At the same time we realise cost has to come down. Pay in Scandinavia is not high, but cost to the company is due to high taxation.
Therefore it is unlikely that pay & benefits will increase near term in SAIL. The rotation of 5/4 is probably a "must" in order to attrackt crew. In Scandinavia the 5/4 rotation is subject to heated discussions every bargaining session at SAS as it takes away scheduling flexibility in a network with large variations in production.
As I understand it, SAIL will have a flater production. Therefore the scheduling flexibility is not that important.