With the recent WOW updates, it now properly supports Hor+. To showcase the proper FOV, I've uploaded a Surround Comparison video for each of the opening cinematics. There are 13 individual cinematics showing the difference between 1680x1050 and 3x1680x1050. Additionally, I have created a montage for all of the Alliance cinematics, and for all of the Horde cinematics.
Source:wsgf
