Sorry to bring up this thread again, but this seemed the most appropriate place to bring this up.
So the other side just released the whitepaper for their 2009 version, .....
http://discussion.autodesk.com/servlet/JiveServlet/download/133-643494-5846818-175973/revitarch09_br...
....and what caught my eye the most was the Swept Blend tool. It seems like they were stung into improving their modeling toolset by AC's Complex Profile tools and Maxonform connections in its recent versions. And while I would be wary of the fact that they only released conceptual sketchy images of what this tool can produce in that whitepaper, one has to wonder what the response from the Graphisoft peeps will be.
I can only imagine that it is probably ( no, definitely) too late to do anything for AC12 if they haven't already done so, but I would hope that these kinds of modeling improvements by the REvit people impress upon GS just how important modeling flexibility and versatility is in design today, with NURB-like tools like these. And I mean INTEGRATED modeling improvements and not cobbled third-part solutions that don't quite speak the same language as ArchiCAD.
Graphisoft, assuming you already missed the boat with v12 ( which is usually a safe assumption with you guys), take note for version 13 next year.