And according to this, Attain is dropping on 08/28 just a day before Sammy announcement whether you believe it or not.
And I don't think Verizon one is dropping last. It will come before iPhone5 at least. That's their strategy, stealing iPhone5 thunder by launching it ahead of it.
Samsung Galaxy S II Release Date and Price Verified | Mobile Bloom News
So I do not think that site is credible, read bolded part below.
"The Samsung Galaxy S2 4G AT&T smartphone finally has a hard and verifiable release date and retail price. At a retail price of between $199 and $249 on the AT&T 4G network, and with date of August 28, all those Galaxy and Galaxy S lovers out there who have been dying for this new phone and who have seen the unlocked versions going for between $700 and $900 overseas don
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