Aeroplan Elite Status Members, Star Alliance Gold, and Aeroplan Premium Credit Cardholder benefits continue to apply
AFAIK, carry-on luggage is not a stated benefit for any of these categories. So the way I read this is elite members can still check a bag but can't bring a carry on on basic fares.
Edit: According to Air Canada's FAQ I was wrong and all of these categories will get a free carry-on even if it's not an official benefit.