Intel is working on a 32-nanometer Xeon processor with six cores, known by the codename Westmere. It is expected that this chip will be the first to be launched on the market following this new manufacturing process of the company, but some internal details and photos of it have already been leaked on the internet, as shown in the Electronist.

Via software, however, it remains identified as a Core i7 CPU, similar to those currently on the market. Your frequency of clock it only reaches 2.4GHz (the lowest frequency Nehalem used in the Mac Pro is 2.66GHz), but it has 12MB of L3 cache shared in all of its cores, with 256KB of L2 cache per core.
Using recent technology Hyper-threading, such a processor accepts up to two simultaneous processes per core, making the number of Colors virtual machines rise to 12 much more powerful than a Mac Pro manufactured until 2008 with two CPUs. A second model, following the same 32 nanometer manufacturing process, should reach the market with only four cores and 8MB of cache, but be able to reach 4.2GHz frequency through secure overclocking (that is, not able to melt the aluminum of a Mac Pro :-P).
Both will hit the market in early 2010.