As I speculated several days ago, Google Docs appears to be morphing into GDrive -- or at least a web-based interface for it.
Some people who heard the news began doing some digging of their own, and have found some interesting things.
First, the filter for "PDFs" has been changed to "Files" in the new interface. There is no reason they would have done this other than for scalability -- a generic "files" filter works much better than one for each type of uploadable file.
Kevin Mohr found an icon that isn't being used anywhere called "icon_4_chome_folder_large.gif"
It's easy to see how this type of folder may be used in the future. When Google announced Google Chrome OS, the mentioned that all data will be stored centrally -- a "Chrome folder" would be the logical place to store it.
I'm definitely looking forward to GDrive!