Info on the frame change as per Cotic site:
February 2012: First production frames arrive.
November 2012: Solaris placed in What Mountain Bikes Top 10 Bikes Of The Year.
February 2013: Latest iteration production frames arrive now using a full Reynolds 853 front triangle. The switch resulted from Reynolds DZB (Dual Zone Butt) tubing becoming available in lengths suitable for 29er use. This down tube allows us to eliminate the gussets whilst still getting meeting the regulations and getting the durability we require. Back to the super clean Cotic lines!