Getting Started Videos with 2012:
http://exchange.autodesk.com/autocad/enu/video-playlist
What’s New in 2012:
http://exchange.autodesk.com/autocad/enu/video/whats-new-autocad-2012
There are a number of screencasts for Architects:
http://usa.autodesk.com/adsk/servlet/pc/index?id=16263766&siteID=123112&ch=USdotcom&src=ADPB&mktvar004=352144