Is it the whole group or just SAS alone? my guess is:
small: Dash8 (Wideroe)
Medium: C-Series and A320/A321NEO
Large: A350 or B787

That way they can operate 4 aircraft familes that doesn't overlap and 2 of them uses the same engines (PW1000G). But the NEOs wont be available until 2016 so what are they going to replace the MD80s with?