How to update
You will need to set Steam to download the beta build. You can do this by locating The Flock in your library, then right-clicking on the entry, click Properties, go to the Betas tab, and select "externaltest" from the list of betas. After you close the properties box, you should see "[externaltest]" in The Flock's library entry.
Important: this update is incompatible with the current non-beta build. Make sure that everyone you're playing with are using the beta branch and are up-to-date.
What's new
This update is mostly a bug fix update, but the one major new thing is the inclusion of a Linux build. While it is not perfect, you can play rounds with others, even with Windows players. There is also another new inclusion, but I won't spoil it for you. You'll know it after you see it a couple of times.
What's fixed
Most of the issues from the April beta thread have been fixed. This includes incorrect level choices, broken scoreboards, quick match, and friend invites. The clipping issue on the Bridge level has also been fixed.
What's broken
Because of the Unity engine upgrade that was performed, there are a couple of new problems. On both Windows and Linux builds, the glow effect from the carrier's artifact may not appear. This is cosmetic only, and should not affect gameplay. On the Linux build, volumetric lighting is quite broken, so you will see light shafts for the artifact and objectives offset to the side a bit ways, and the view will be blurrier than usual and with ghosting. These issues will be investigated in depth, and we'll try to fix them for the next update.
The population
The population countdown was the most unique and controversial feature of the game. Unfortunately, because of Vogelsap's current state, the population server could not be maintained. As such, all population features have been removed from the game. It may see reintroduction eventually, but for now, the game is free of counters.
Take a look at the beta, and encourage your friends to try it too. Please let us know what you think, and post any bugs or requests on this forum thread.