I lost hope seeing the phone officially in Canada so I got it last month from omega cell.
If you read my review on it here
http://forums.windowscentral.com/showthread/273254.htm you will notice I mention discovering Canadian roms for the Lumia 1520 (RM-938) on the Nokia servers dating back to January this year, but those were SWAP roms that are missing some of the bands.
I'd be very interested if Canadian carriers bring the phone, most probably it will be the RM-938 variant, and I would be able to flash my device with one of the official roms if they make newer ones available with all the bands and no missing features.