It looks like Batman: Arkham Origins will not be getting any more patches any time soon. According to the game's community manager, the team is "working hard on the upcoming story DLC, and there are no plans for releasing another patch".
Here's the full message:
"The team is currently working hard on the upcoming story DLC and there currently are no plans for releasing another patch to address the issues that have been reported on the forums.
We apologize for any inconvenience this has caused for some of you, and want to thank you for having been patient."