I was looking at booking a YYC-YVR-YYC Aeroplan trip a few days ago for late February. Most of the flights were available with Classic, but I wanted one of the flights which I had to use my priority reward on. Didn't pull the trigger because I'm still trying to figure out my dates.

Checked again this morning after seeing this thread and got the result:

No Air Canada SuperElite 100K Priority Rewards were found for this itinerary.

Which is obviously not true, given there was yesterday. All of the Classic fares are the same and the Market Fares are actually lower than ClassicPlus was. I'm going to give AP the benefit of the doubt and suggest that they messed up the roll-out and the SE Priority Rewards will return after they fix the bug.

I couldn't find Priority Rewards on ANY flight between YYC-YVR in all of February.