Intel does show x-core CPUs for some years during Intel Developer Forum (IDF) events. They already had 80 core and 50 core chips there in the last years. Look for "Tera-Scale" and so on.
Also, search for "Transputer" in some spare time. It´s old but still fancy from a technology point of view.
And for the good news: Channelweb got a leaked roadmap showing Westmere-EP 6 core CPUs launching at March 16th, 2010.
This also fits into the update cycle of Apple, so there is a possibility that a new MP will come in March.
Westmere-EP 6core launch March 2010
Nice fact: The Westmere won´t require new Motherboards nor Sockets, so it may be possible to upgrade 2009 MPs.