From Esri the official availability of the ArcGIS 10.1 Beta program... Join the beta program to discover and test the upcoming features in ArcGIS. Now available to US customers or customers outside the US who are current on maintenance and have been nominated by a local rep (interesting) This from the official Esri resource:
The ArcGIS 10.1 beta program is a great opportunity to test our latest software. Joining this program provides you:
Access to ArcGIS 10.1 beta software prior to the final release so you can test your workflows and processes
The opportunity to discuss the beta software with other testers and Esri staff
The ability to contact technical support via phone, e-mail or chat
Tools to report bugs and track their status
You can test ArcGIS 10.1 beta on the desktop, server, or mobile platforms.
See the ARcGIS Beta Community