The new subaru doesn't employ auto leveling mechanisms like the older JDM versions because it has a set of low and high beam HID's. The only part of teh halogen housing I can see being different is perhaps a diffuser or reflector, but I would assume that that's also swappable. If you look at the pics of the canadian WRX and teh american one the headlight assemblies look identical. Like I said before I think that we are the only market that's getting halogens, I seriously doubt tehy would manufacture new housings for our piddly market but who knows. I know I'm keeping my fingers crossed that teh differences are minimal.
PS: funny april fools trick with the "the" trick