Starting in 2014, unless you are super elite, you will need to pay an extra $500 to upgrade a North America to Europe flight, or $750 for using your eupgrades to upgrade a North America to Asia flight.You can check this link for all the info.
The other thing I have noticed is that the cost of Air Canada flights is getting more expensive. I have to fly to Asia in February and I got an economy ticket under $1,500 with Delta which was over $3,000. This does mean I have to fly through the US which means an extra layer of customs, but the price difference is significant. Most companies that I know are asking their employees to use competitive comparisons which makes it more difficult to justify the Air Canada prices.
Since I got status marched on Delta this year- I am starting 2014 with Air Canada Gold and Delta Gold. For now I will be putting most of my flying with Delta and see how that goes.