It's officially called OpenStreetMap Collaborative Prototype, Phase One and has been available since July 5th. It reveals the results of a protoype on road data done with the state of Kansas (APB coverage). The conclusion from the abstract:
Resulting data were successfully improved to meet standards for The National Map once the system and specifications were in place. The OSM software proved effective in providing a usable platform for collaborative data editing.
- via @mhacklay