Baseline (Widescreen) Solution & Issues
The game appears to use 16:9 as the base aspect ratio for FOV calculation. Any aspect ratio narrower than 16:9 uses Vert+, and anyone wider uses Hor+.
The bonus featurette is an upscaled 720p stream that's oddly windowboxed in all resolutions. Better watch the original .bik from within the install folder...
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Optional FOV Edit
In "Engine.ini" add or change the following:
[/Script/Engine.LocalPlayer]
AspectRatioAxisConstraint=AspectRatio_MaintainYFOV
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
You need to select Windowed Fullscreen mode for MultiMonitor to work. If you select Fullscreen the side monitors will turn off.
4k UHD Specific Solution & Issues
Stereoscopic-3D Solution & Issues