Yes, that's what I was thinking as well, I'm gonna order mine from DVDWORLDUSA, the US release is Sept 16th & will probably get it a week or two early from them.
As far as I'm aware the UK release is December 1st.
They've also done this with 300: rise of an empire, that's been available since end of may early JUNE in the states but is not out here until September, but having seen it at the cinema I'm prepared to wait for that on Blu-ray