While the site is known not to be updated all that quickly, Aeroplan does advise of such changes by partner carriers, as witness the LH situation this summer when we were provided with two or three months advance notice.

And it would be SAS that removes eligibility of fare class, not Aeroplan, as SAS is paying for the Aeroplan miles. It is highly unlikely they'd screw themselves on their own promotion by making these flight non-status or discount mileage ones. These flights have always yielded full 100% status miles since the promo has been going.