Hi, we've just launched the public beta of Plex.Earth 3, which runs on AutoCAD 2013.
With Plex.Earth 3 you can import imagery to create mosaics or terrain from GE, to publish to KMZ/KMZ, but its strongest points is that from now on you have the ability to connect directly to Bing Maps, OpenStreetMap, ArcGIS Servers or any other WMS provider to import images.
I hope you'll enjoy it and we're looking forward to send us your feedback.
Google Earth AutoCAD
Plex.Earth Tools for AutoCAD