From this release onwards, you can now opt-in to beta releases. Simply open the main menu, select Settings, and in the new Updates section select "Notify me about updates for Beta releases". Now you will see a notification when a new beta release comes out, allowing you to easily stay up-to-date with the latest beta if you so wish. (Previously beta users would not see any notifications.)
We've also completely rewritten the Google Play plugin to work on Android. A while back Google annoyingly pulled the plug on allowing the Web API to work in Android apps (we still don't know why). We now switch to a secondary API when in Android Cordova apps to use the native API and make sure the plugin keeps working. Note this requires a considerably different process to configure Google Play Game Services; we'll be providing additional documentation to cover this soon.
This release also adds a few quality-of-life features like extra keyboard shortcuts and menu options. We've also got a bunch of bug fixes, including more for the desktop build. Note previously if you used the desktop build there wasn't a convenient way to use beta releases. Now however there's a new desktop build download that is tied to the latest beta release - see this thread for more details. Additionally from the next stable release, you'll also be able to use the beta opt-in with the standard desktop download.
Finally, we're very pleased to release the Spanish and Czech languages as enabled by default! Many thanks to our contributors who helped with translation; we will be sending out rewards shortly. We're also very close to having the Portuguese (Brazilian) translation finished - it currently stands at 98%. Hopefully we'll be able to release that one soon as well! If you'd like to help get involved, see this forum post to get started.