FYI, it seems the only visual identity change for the new model consists of the words "Series 2" being stamped on the rear near the mains socket. Correct me if I'm wrong, but if that is the only visual clue, it would pay to check for it at the time of purchase (I noticed my local vendor still has series one, which appears unstamped). You can see the "Series 2" stamp here...
http://www.berkeleyaudiodesign.com/products3.html