CNet is saying that Intel is expected to announce its first six core Xeon processor on September 15th.

The "Dunnington" a.k.a. Xeon 7400 apparently has:

• six cores on one die
• Penryn based cores
• 16MB L3 shared cache
• 45nm high-k process

Mind you, this information is apparently based on what server vendors told Intel - who is either laughing at a successful disinformation campaign or sharpening knives for the server vendor once it locates the leak.