It's another Call to Action, this time on a version of Derelict Watcher: "Derelict Watcher TE (2.0.8 Balance v1.1)". The changes for this map are as follows:
Protoss
- Warp Prism
- Movement speed increased from 2.5 to 2.953 (previously 2.5 to 3.375.)
- Acceleration increased from 2.125 to 2.625 (previously 2.125 to 3.25.)
- The Gravitic Drive upgrade has returned to the Robotics Bay and will increase movement speed to 3.375 and acceleration to 3.25 when researched.
Terran
- Hellbat
- Attack damage decreased from 18 +12 vs. light to 18.
- The Infernal Pre-Igniter upgrade increases attack damage from 18 to 18 +12 vs. light.
- Banshee
- Cloaking Field research cost decreased from 200/200 to 100/100
- Cloaking Field research time decreased from 110 seconds to 90.
You can read the full Call to Action here.
Source:
Battle.net - Call to Action: June 14 Balance Testing