Source:
https://armoredwarfare.com/en/news/general/update-0355-now-available
Regarding the elephant in the room, aka the nerf in credit multiplier for Spec Ops and particularly that on Heroic difficulty, SS claims it's required for "future healthy economy" and that Heroic difficulty Spec Ops no longer provided a challenge for players while it remained as a money printing machine. As for why they took action with this mode practically left untouched for so many years, and without prior notice, is unknown.
As for VN20's deployable turret, there are still several ongoing problems with it since its debut, including its ability to elevate gun, hence it will try to shoot targets that are beyond the grenades' reach. Although the devs have added the function for the player to instruct the turret which target to shoot, there is no visual indicator as to who it is targetting that way (unlike infantry).