So far there's two big changes in 0.4 wrt Russian tanks.
One, the FCS is always on and no longer needs to be turned on separately (no "laser designator" weapon anymore) and two, reloading rounds by unloading the current is no longer possible. Instead using the "Reload xyz" in action menu loads that round as the next.
For example, if you have AP loaded and reload HE, you'll still have AP loaded, but once you fire the AP, it'll load HE as the next round. So basically you have to plan ahead now when selecting ammo.
Exception seems to be T-80 (the "vanilla" one, other variants such as T80A, T80U look ok) where FCS weapon is still present and reloading doesn't work, I guess that one is bugged.
The new artillery pieces (M119, D30, M252 and Podnos) use vanilla Artillery Computer.
M119 and D30 can be folded using action menu, not sure if there's any functionality to that other than looking cool. You can raise/lower elevation on them to fire them manually like the self-propelled artillery. They can also be slingloaded by Chinook and CH-53. There's also an AT variant of D30, useable only in direct mode.
One, the FCS is always on and no longer needs to be turned on separately (no "laser designator" weapon anymore) and two, reloading rounds by unloading the current is no longer possible. Instead using the "Reload xyz" in action menu loads that round as the next.
For example, if you have AP loaded and reload HE, you'll still have AP loaded, but once you fire the AP, it'll load HE as the next round. So basically you have to plan ahead now when selecting ammo.
Exception seems to be T-80 (the "vanilla" one, other variants such as T80A, T80U look ok) where FCS weapon is still present and reloading doesn't work, I guess that one is bugged.
The new artillery pieces (M119, D30, M252 and Podnos) use vanilla Artillery Computer.
M119 and D30 can be folded using action menu, not sure if there's any functionality to that other than looking cool. You can raise/lower elevation on them to fire them manually like the self-propelled artillery. They can also be slingloaded by Chinook and CH-53. There's also an AT variant of D30, useable only in direct mode.