This is what I've been able to piece together for Canada:
Standard Releases (Available Everywhere)
- DVD - Just the movie (1 disc)
- DVD - Movie + Special Features (2 discs)
- Blu-Ray - Movie + Special Features
Only At Future Shop:
- Blu-Ray Steelbook version
Only at Walmart:
- DVD with extra IMAX footage
- Blu-Ray with extra IMAX footage
Only at HMV:
- DVD with transforming Bumblebee case
- Blu-Ray with transforming Bumblebee case
Only at Best Buy:
- Blu-Ray bundle with Optimus Prime head and $50 gift card for Sideshow Collectibles
There is a DVD steelbook release from Future Shop, but as far as I can tell it will be released only in the USA at Fye's stores.
Best Buy will have the above bundle package in the USA; it is assumed (but not guaranteed) that we will get the same bundle in Canada. There does not appear to be a Best Buy exclusive DVD release.
The HMV transforming case is the same one that Target offers in the USA.
I don't own a Blu-Ray player (and won't be getting one any time soon) so I'll probably end up getting the Walmart DVD release.