AMD has been working on Barcelona for quite some time now but theInquirer has got some hard dates listed on their websites with clock speeds as well.
They are saying that the first of the Barcelona chips will show up on September 10th, 2 of them to be exact. A 1.9GHz numbered by AMD the 2348 and a 2GHz 2350. 2.1GHz 2352 and a 2.2GHz 2354 will be released in October.
the Inquirer has a lot more information about AMD Barcelona Clockspeeds.