Baseline (Widescreen) Solution & Issues
Native
The game renders vert-, however there is an in-game FOV setting. The slider goes from 60 to 120, increasing both horizontal and vertical FOV. All these shots were taken with 120 FOV.
(bear with me on the screenshots.. in order to change the screen resolution you have to close the game and change it from the start menu and restart the game >_< I did my best. )
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
Triplehead resolutions should be automatically detected by the game and placed in the resolution menu accessed prior to launching the game. The 120 FOV cap doesn't change in TH resolutions, and there appears to be some stretching.
4k UHD Specific Solution & Issues