An unofficial Alpha 29 build is out on the BETA branch. Check it out if you're an experienced player and want an early glimpse of all the new stuff!
Please post your feedback in this thread or in the comments below.
Please don't opt in if you are new to the game, as this build is very unstable, and the tutorial doesn't work at the moment.
To opt into the build, please go into the game's properties, BETA tab, and choose the "dev" branch.