UPDATED with additional information from Developer Tracker.
Here is the new Mercenary Set Bonus coming in Game Update 6.1.1. It is healing focused.
Set Bonus – Rapid Response
Mercenary
(2) +2% Mastery
(4) Activating a healing ability has a 15% chance to cause your next Rapid Scan to be critical.
(6) Healing an ally with Rapid Scan applies a buff to them for 10 seconds. Each enemy defeated by this ally increases your healing by a 2%, stacking up to 5 times.
Commando
(2) +2% Mastery
(4) Activating a healing ability has a 15% chance to cause your next Medical Probe to be critical.
(6) Healing an ally with Medical Probe applies a buff to them for 10 seconds. Each enemy defeated by this ally increases your healing by a 2%, stacking up to 5 times.
This set will be a guaranteed drop from NIM Dxun.
This Set Bonus will be the guaranteed Mercenary/Commando Set Bonus from the Master Mode difficulty of The Nature of Progress Operation. (Note: This Set Bonus will also have a small chance to be gotten via the random boxes from either Kai Zykken or the Spoils of War Vendor.)
This set will be available for testing on the 6.1.1 PTS along with other new Set Bonuses, Class Changes, NIM Dxun and Conquest Changes.
I am really happy for getting the prize