Ahh, how technology moves quite fast.
Tigerton is the product that will complete the Xeon range's shift to multicore. In a briefing in San Francisco last week, the vendor powered up a server running four Tigertons, meaning the beast was running 16 cores in total. The system was running the Clarksboro chipset, which means individual links between each chip and the chipset, and ends those worries about bottlenecks.
So, clearly, Intel is pretty confident about the technology. Confident enough to bring forward the release date for four way systems? Ah, not exactly. It's still going to be the second half of next year before they hit the market.