You should be patient, it's weekend...

My guess is there will be a development build on Monday.

Development build is being updated continuously, you get access to it by right-clicking on Take on Mars in your game Library and selecting Properties->Betas->Development. There is also changelog in the bottom right corner in the Main menu, where you can see all the changes that has been done to the game. Main build will be updated tomorrow on Tuesday 13.8. (all the changes from Development build will become available in the Main build).