This might be happening. I dismissed the EB games fiasco as BS. Just some over-zealous employee who went too far with photoshop.
But an actual professional flier, even if it is Canadian, is far more convincing.
It's very common for retailers to slip up and advertise things that haven't been officially revealed.
I mean listings for a RE4:Wii Edition popped up weeks before the game was officially announced or shown off.
Only thing that gives me doubt is the Sonic model in the advertising is reused from a past Sonic title while the other models are originals created for the actual game.