Love to have the planes waggle wings when they have spotted the enemy.. maybe hand movement animations and flares.

Also like leader streamers and for the pilots face to get gradually more dirty due to oil...Also like to see some more pilot faces.

Also new arty registering features.

Plus bigger range of ground explosions and shrapnel rounds.

Also mines to go off at the correct time and have MASSIVE explosion and crater formed! Also like to see major historical mine craters visible by air.