This is a nice little new feature added to some commands found in Civil 3D 2012 that really caught me eye. For example on the HOME tab>CREATE DESIGN PANEL>ALIGNMENT>ALIGNMENT CREATION TOOLS you will notice if you pause over this, the normal description fly-out will appear. However there is a new option in the lower left corner letting you know that a video is loading:
If you continue to pause for a few second while the video loads, the fly-out will expand once again revealing a neat little video showing some basic functions found within the command you are bout to load.
Although not a major feature I thought this was a very nice touch to the user interface that should help both new users and seasoned veterans alike.