So there are a bunch of videos roaming around about a very early 2004 build being playable. This was apparently resident on the retail discs without ever being officially accessed by anyone, as everyone would have acquired the day-one patch on release. Unfortunately, the essential files on the discs, while readable, seem to be encrypted. I've seen references to a GCF decryption tool that would allow one to peek into past and perhaps find ties to the beta build we all know and love, but I haven't been able to find a working link anywhere.