As of Oct 3 enemy ground units can now see thru buildings via line of sight and also radar. I tested in single player and multiplayer sinai cauc and syria. Nearly impossible to run an gun with the kiowa, huey, apache, gazelle etc. since the enemy units have you pre locked as u come around the corner, no delay to aquire you as it did before patch. Image above shows bmp and shilka with a bead on me and RWR stating locked from the shilka, dispite being behind a building and on the ground. Obscured target highlighted with red circle in attached image. Happening with all ground units Sa13s, tanks, iglas, KS19s/flak etc.
Oct 2 it was working fine, I would come around corner of a building and I would have enough time to line up a shot as the BMP/BTR turret would turn towards me, not the case after oct 3rd, now come around the corner and barrel is already on me, dead.