It's an off-record experiment that they did, so it is not supported by Apple. Officially, there is no 2 x 4 core Apple machine yet, but in theory nothing prevents them to build and sell one. The problem for the big names (Apple, Dell etc) is : how to justify selling a new high-end machine just a few months after the Woodcrest one, and say to recent buyers : the workstation you spent $$$$ on, just two months ago, is now obsolete, thank you ;)