The distinguishing features between the figures, other then the figures themselves will the head shot on the right hand side of the box.
The back will more then likely display Ironhide, Silverstreak and Sideswipe. It us unclear at this point if it will show Galvatron or Acid Storm included in the bunch instead of the bio the normally seen on the back of standard U.S. packaging.
Remember, when you see this on eBay in the few months it's not a super rare packaging variant. It's just Canadian packaging.
Hasbro Canada has stated that the will be using more unique packaging some 2009 when the start to celebrate 25 years of Transformers.

To see the original auction, click here