I have come up with some sort of fix for ppl which will like to get rid off black bars till Blizz fix this, myb for someone will not be the best solution but for ppl who would like then here you go =)
Sample from Predator x34:
https://goo.gl/Qz5W9Ahttps://goo.gl/kR1vWKhttps://goo.gl/MhltB1https://goo.gl/TXlfsk1. If your desktop is not native 3440x1440 then make one in Nvidia control panel and make it active on desktop
http://prnt.sc/b9axi12. then go to "Adjust Desktop Size and Position", check mark on Full-screen, Perform scaling on: GPU and check box on "Override..." Set resolution to 2560x1440
http://prnt.sc/b9axb23. Start the game, go to Options and then Video, change resolution to 2560x1440 and WUUALLA
If you want to get more perfect quality then increase "Render Scale" (oc if you have good horse power of gpu)
if some one does not find this helpful then other solution to make black bars a bit less then they are, make Customised resolution 3000x1440 and make it use in game and you will have less black bars on side
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