No radical design variations this time
According to Android Police, the Galaxy S3 will not undergo radical design transformations as the U.S. variants of the previous Galaxy S generations did, and there should be no delays in the Pebble Blue version in the U.S. as there were elsewhere. One exception is that the AT&T version will also come in red later this summer.

When can I get it, and how much will it cost?
Preorders begin on June 5 for the Sprint version, on June 6 for AT&T and Verizon, on June 12 for regional carrier U.S. Cellular, but evidently there will be no preorders for T-Mobile. The T-Mobile and Sprint versions will be available on June 21, while Verizon’s version will be available “in the coming weeks” and AT&T has not yet announced an official launch date. U.S. Cellular’s version is expected to be available in July. All 16GB models are expected to sell for $199.99 subsidized, with the 32GB models selling for $249.99 subsidized on U.S. Cellular, Sprint, Verizon, and T-Mobile. AT&T will not be offering the 32GB model, though it will make a 16GB MicroSD card available for $39, allowing you to get 32GBs on your phone for $238.99.

What specs are different for the U.S. models?
As stated before, the U.S. variants of the Galaxy S3 were expected to feature the Snapdragon S4 processor instead of the quad-core Exynos 4412 chips featured in most overseas markets, due to incompatibilities between the Exynos chipset and LTE radios. However, Samsung decided to throw in a consolation prize for U.S. customers: 2GB of RAM (international versions only have 1GB of RAM). The boost in memory should at least partially compensate for the lack of a quad-core processor in the U.S. versions. More details on the Verizon version, and some exclusive photos taken from Verizon’s sales system, can be found here.