Please read the entire thread before joining.
The test has already begun and will continue until the beta testing team believes that enough information for bugfixes has been collected. Beta testers and developers may ask you to do certain actions in order to find bugs or other issues in the server, and in those cases, you should do as they say. Otherwise, you should play as your normally would on any other server.
The gamemode is an Attack/Defense and Capture The Flag hybrid. Two teams of players each have their own bases and points, and the objective is for a team to capture the opponent's base by standing on their point for a combined 15 seconds. You can get more information by joining the server.