So just was in an icc (raid group), hearthed, went to dal, qued for wintergrasp; and this was the result:
https://i.imgur.com/7Pme4YB.jpg
no npcs, no walls etc. Not sure if this can lead into more for other people (i.e arenas or being able to run through certain objects).
Just thought i'd share incase this is useful to anyone however I doubt this is intended.