Baseline (Widescreen) Solution & Issues
All resolutions are supported natively, but only at the highest available refresh rate for some reason. FOV is vastly Hor+, with a slight Vert loss.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
The game works pretty great natively in 21:9. Some minor issues occur though. The HUD remains in the same location as on a 16:9 display, obstructing the view slightly more than is desirable. Overlay effects like the low health effect are still at a 16:9 aspect ratio in the center.
Some cut-scenes display at 21:9 some at 16:9.
Eyefinity / Surround Specific Solution & Issues
Half of the real-time rendered cut-scenes are strictly anamorphic 16:9, the other half are as "vastly Hor+" as gameplay.
Likewise some specific minigames have anamorphic gameplay: karaoke, camera hacking, lockbox safecracking. See additional screenshots.
Apparently there are a few FMVs at key points of the story as well, I have not seen any yet. (Editor: Setting behavior on FMV to anamorphic. This is the highest probability of performance. Can be corrected if needed.)
(Negligible) the HKPD logo on the security camera monitoring interface stretches !
4k UHD Specific Solution & Issues