Well, judging by the amount of vehicles we're seeing on Canadian Shelves, I have to assume that A) Hasbro ran a LOT of them and B) the American Market's already been saturated nicely, if there's enough to sit on shelves here.
If the same is true of this next wave, then there should be a LOT of vehicle waiting in warehouses for the current wave to eventually move. They might slowly release them into the Sates, but I'd bet they'll eventually find their way here.