Posting on Batman: Arkham Knight's official forums, a community manager for the game, Coda, has said that the developers at Rocksteady are aware of the problems some users are facing with the PC version of the game, which I detailed in some depth yesterday.
The spokesperson states that the game was ported to the PC by a third party studio (meaning Rocksteady isn't responsible)
Here's what he wrote:
We're aware that some users are reporting performance issues with the PC version of Batman: Arkham Knight. This is something that Rocksteady takes very seriously. We are working closely with our external PC development partner to make sure these issues get resolved as quickly as possible.
We'll be providing updates on the matter as it develops.