The big news:
"Topobase is now part of Map!" Topobase is a tool Autodesk bought a few years ago aimed at the utility/infrastructure space. Now its guts are inside the desktop, too.
"There are two flavors of Map this year - Map 2012 and Map Enterprise 2012. The major difference is that Map Enterprise 2012 includes enterprise database functionality linked with Oracle that once existed in the Topobase products." I guess that makes sense since so many map users are still "ones and twos" and don't need that functionality.
"Storm & Sanitary Analysis (SSA) is included in Map/Map Enterprise 2012. This is something that came out as a add-on in the 2011 release and was marketed to the Civil folks. Now us GIS folks can use it too!" This is another packaging change: putting the add-on into the box. Clearly this is not applicable to all users.
There is also a long list of feature enhancements. These are all focused on the product itself or AutoCAD and the interface.