I'm okay with the darkness. It adds back that element of horror from the fixed camera perspective of not knowing what lurks off screen, and it's also a good excuse for players to explore every inch of the environment for hidden goodies.
And yeah, I think Mr. X is gonna be a lot like Jack Baker this time, as in just freely roaming the police station. Which I can see how that can be annoying, but from a survival horror perspective, it sounds awesome. Especially since he looks way more intimidating and more aggressive than Jack Baker.