Well, I did get my hands on finally on a U.S. Galaxy S3 model, all of them which are identical to each other as far as main hardware specs go. Here’s unboxing of T-Mobile Galaxy S3 SGH-T999.
I did not see much difference as far as outer appearance goes in comparison with the international GT-i9300 model. The only real difference is that the U.S. versions come with Qualcomm S4 1.5Ghz dual-core instead of the Exynos 1.4Ghz Quad-core processor. But I think this is good move on Samsung’s part as now consumers don’t have to get carrier-specific accessories for their Galaxy S3 instead just grab any Galaxy S3 accessory.