There are 2 major changes. In the game options you can find a new option called "Co-op AutoSkip". The auto skip function will automatically pass your turn when you cannot play any more active moves. This is still a very experimental feature, right now only dedicated to co-op. Improved game performance. Adventures load faster, less RAM consumption. Here you can find how to access the test server via Steam http://forums.cardhunter.com/threads/how-to-use-test-server-steam.12380/.