Google is holding a special event in Washington DC tomorrow. The event will launch the "...newest addition to Google Earth". July 20th is the 40th anniversary of the Apollo 11 landing and the list of speakers includes Buzz Aldrin and other members of NASA. This has lead Frank Taylor of the Google Earth Blog to suggest that Google will almost certainly be unveiling a 3D Moon mode for Google Earth tomorrow.
The event is being held at the Newseum in Washington DC at 11am. Google say that "if you can make it, it would be great to see you there", so it looks like it will be an open event.
Today I found the astronaut pegman images (above) in Google's 'mapfiles' site.
Update - Astro-Pegman is now live in all Street View coverage on Google Maps.