Ark Survival Evolved has been updated to version 2.73 today by Studio Wildcard. You can find out the complete patch notes from here.
The latest update appears to be related to a server outage that the game had experienced earlier. This led to the game being unable to play online, so if you were one of the affected you can now try again after updating to the new version of the game. The patch notes below are for the last major update that was released for the game.