Had a 4v4 game the other day where it looked like both British players were firing "Artillery Commander Concentration Barrage" into FoW. Watching the replay shows them dropping the red flair fairly deep into the FoW, which seems a bit strange, since the patch notes state that it "Can no longer fire through the FOW".
It's possible the replay playback is bugged (some units show in fog anyway?), but it seemed pretty strange in-game, too. That, or I've completely misunderstood the patch changes.
What is wrong with the replay?
And yes you should not be able anymore to use it through fow as far as i know.