It is the biggest update for the IDE and introduces many additional features and improvements which will be briefly summarized here.
Multi user realtime editor synchronization
To allow multiple users to work on a project at once in a challenge environment like ECER a realtime editor synchronization was implemented using sharedb.
Another post goes into further detail about the concurrent editing.
Hedgehog Control page
Sensor can now be monitored and motors and servos can be controlled through the Hedgehog Control page.
Many bug fixes
There were a few bugs that needed fixing and the final debug sprint made short work of these.
This version will be deployed to all Hedgehog controllers prior to ECER 2017.