Let me provide some assistance on this one.
The intended successor for the Intel® Workstation Board W2600CR2 is the http://www.intel.com/p/en_US/support/highlights/server/s2600cw Intel® Server Board S2600W Family.
As noticed, we are not using the label/tag "Workstation" in the name. I could not find a technical reason of why we are not using it but most certainly this is the correct product to consider when upgrading from your current Intel® Workstation Board W2600CR2.
Here is a http://ark.intel.com/products/codename/75760/Cottonwood-Pass list of the possible versions of this family. Feel free to reach me out if further information is needed.