Check out the details here: https://youtu.be/8L8Byf3RI2c
Blog post available here: http://blog.wolfire.com/2017/02/Overgrowth-Beta-2-video-changelog
Full change log is available here: https://docs.google.com/document/d/14cAIF4b-vmgikZPH6UxVYrFYLiG2kV21nlvPjjorr90