CSA introduces new changes in the allowed free weight of baggage and also changes in fees for excess baggage. The change applies to tickets issued from February 25, 2015 inclusive.
More information can be found on the airlines website under this article Carriage of Standard Baggage for tickets issued on/after 25 February 2015 and Charges for Exceeding the Free Baggage Allowance for tickets issued on/after 25 February 2015.