.... Yes is that time of the year again, Autodesk is getting ready to release the 2012 products, so here is a Comparison Matrix for AutoCAD Civil 3D 2010 - 2011 and 2012, where you can see all the Supported Features, Enhanced Features and New Features added by Autodesk to Civil 3D in every release....
Release Comparison Matrix for AutoCAD Civil 3D
Release Comparison Matrix for AutoCAD Civil 3D