I played the demo, and it looks like this game have some problems at 3840x2160 with in-game cutscenes.
Also, the HUD and text is tiny, but other than that it seems to be fine.
Gameplay
1280x1024
1600x1200
1920x1200
1920x1080
2560x1080
5760x1080
3840x2160
EDIT:
Actually, you know, it's not a problem with UHD. It's a problem with the height, the vertical resolution.
Starting from around 1600x900 the bars keep growing with every increase in vertical resolution
in-game cutscene
1600x
1200, 1920x
1200, 1920x
1080, 2560x
1080 2560x
1600, 2560x
1440, 3440x
1440 1600x
900, 2880x
2160, 3840x
2160, 5120x
2160 I tried to patch the demo, manually adding files from the patch, there was some error, but i was able to play the game.
But i don't know if the patch was really applied, the version(number) of the demo is still the same... so i don't know.
Maybe someone with retail & patched version could confirm this behaviour