Some more details about the AMD Barcelona arrived on FUD Zilla's website. They claim that it's not certain that the AMD K10 processors won't be available until the fourth quarter of this year because the current revision needs another update.
Maybe AMD will launch some Agena processors at the same time but the bulk of the K10 desktop processors will likely arrive by early 2008.
A bit more positive news is that AMD has resolved the TDP problems with the K10 processor. FUD Zilla heard from their sources that sample chips are now running at 1.6GHz with temperatures of 32°C. The final chips will be able to run at 2.4-2.8GHz:
AMD will initially launch K10, Barcelona and Agena in frequencies of up to 2.4GHz, but the same core can go all the way up to 2.8GHz with the existing 65 nanometre process.
AMD will save these speeds to compete against Penryn, as at high clocks it will need it, at least until the company is ready for its 45 nanometre processors.
Even at 2.8GHz, the Thermal design Power from the K10 is at an acceptable rate and indicates that the K10 should be overclockable even beyond 3GHz.