Without spoiling too much, the above image is from the Battle for Azeroth alpha and showcases an instance of Stormwind that has both a different skybox and fog effects on the ground.
Last week, Seething Shore made its pseudo-premiere in World of Warcraft, thanks to being available for a week as a "preview Brawl." Now, the battleground is officially part of the standard pool of random-queue options, but with a couple of adjustments.