Air Canada has announced some changes to its Altitude program.

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Air Canada

Introducing redemptions to Premium Economy
In early 2015, Aeroplan members will be able to redeem their Aeroplan Miles for Premium Economy seats on Air Canada. Details will be forthcoming soon.

250 Mile Minimum
For travel as of March 1, 2015, miles earned will be based on the actual distance flown and the fare option purchased for each flight operated by Air Canada, Air Canada Express, Air Canada rouge and Star Alliance™ member airlines. Mileage accrual will no longer be rounded up to a 250 Mile minimum. This change includes Rapidair flights between Toronto Pearson International Airport and Montreal or Ottawa, or between Toronto City Centre Airport and Montreal.

Here is the updated chart: