It looks like it's currently an A320, this could change. The A320 has two exit rows over the wing. Whereas the A321 the exit rows are infront of & behind the wing. Seatguru is not up to date, also keep in mind that AS is also renumbering the rows, you can read about some of it in this thread Seat Renumbering. At present, knowing how many exit rows there are and where they are located, would be your best indicator of what version of Airbus it will be.