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[Alex]

I believe the primary reason for it is the difficulty of waging a global marketing campaign. Looking at the release schedule it looks like maybe they spread traditionally spread things out to the English speaking markets in 4 to 6 week gaps. At least this time you're ahead of UK in line (for Wall-E they got it a month earlier, this time they wait until October).

Bit of if it helps, Japan doesn't get it until December.