I've pulled the first video that didn't have any audio on it; instead, look at this video from the GDC floor that demonstrates this technology, called Project Skyline. Enjoy! 

area.autodesk.com/gdc2011/pd_gameprev

This video is a technology preview. Autodesk wishes to caution you that this preview reflects technology research, and that actual events or results could differ materially from the preview. Also, this preview is not intended to be a promise or guarantee of future delivery of products, services or features but merely reflects technology research, which may change. Purchasing decisions should not be made based upon reliance on this preview. Autodesk does not assume any obligation to update any statements we make to reflect events that occur or circumstances that exist after the date of this technology preview.