When I looked at the Buick web site I saw the above trims and pricing was for the 2017 model year. They had also had the below listed pricing for the 2016 model year for the Premium I & II trims.
Model Year 2016
Premium I: $42, 995
Premium II: $45,635
Model Year 2016
Premium I: $42, 995
Premium II: $45,635