Mike Magee over at the Inquirer had got his hands on the first confirmed Barcelona model numbers and he's even got pricing information and a confirmed launch date, September the 10th. Mike is rarely wrong when it comes to this kind of stuff, although don't expect this to be written in stone.
The models are as follows:
We're of course talking Opteron CPU's here and the models above are for dual CPU systems and have native quad cores. Each CPU will have 4x 64kB L1 cache and 4x 512kB L2 cache.
Only the 2348 and the 2350 will launch in September, with more models launching in October.
You can read the original story here and there's some more information about the new 8-series of Opteron processors as well, although no confirmed launch date for these parts.