Just an really late update:
The rendered cutscenes can be 'unlocked' - yes exactly like those in Witcher 3 - same procedure.
You can either follow the steps bellow or grab the modified .exe
1) Remove Steam DRM with
Steamless- Point Steamless to QuantumBreak.exe and let it do it's thing - it will create QuantumBreak.exe_unpacked.exe
2) Modify the unpacked .exe by replacing 2 occurrences of 16:9 (398EE33F) with (8AE31840)
3) Save it! Watch time freeze in 21:9
Modified .exe:
Fix available from the
PC Gaming Wiki Community Files (search there)










EDIT: I just noticed that there are missing horizontal lines on top and bottom 6 pixels in height.
http://screenshotcomparison.com/comparison/133138