RogersMary (the Rogers rep we've been dealing with via Twitter, email, and these forums) just informed us a few moments ago that Canadian owners of the Rogers Dream would be given a limited time opportunity to exchange their Dreams for HTC Magics, so they would be able to get the forthcoming updates.
Details are to follow, and there is nothing official in-store or online yet. I would assume this is only for people who bought their phones through Rogers, ie. if you bought it on ebay, I doubt you'll get an exchange.
Here is Mary's post in the forum:
Rogers Dream 1.6 Update