A friend just got the Combined Arms module so I've been spending more time with it coincidentally since the switch to 2.8.
Since the update, when you lock a target with a vehicle you're driving (such as an M1A2), and lase the target for ranging, the aiming circle will no longer move to where you aim, regardless of what range you've lased - previously, it would move accordingly and be different for HE rounds vs. AP rounds due to the different muzzle velocities. Now, there's nothing - the aiming circle is useless.
Also, in the Combined Arms missions, specifically the one for the Leopard, the friendly AI vehicles do not move when the mission starts, or ever. They simply sit in place instead of advancing towards the red forces. This is a new issue in 2.8 vs. 2.7.