With the scheduled weekly update and more beta invites, Valve has now released the server files to the public. You can find the complete instructions on installing the servers here. Take into consideration this server files are still in beta and many features have not yet been implemented. However we are now seeing many more variations in gameplay than the standard formats, in particular AWP Deathmatch servers!
As per usual you may see the update changelog here & good luck to all those still waiting to receive a key.