Rocksteady released a statement on the official forums. It's not much.
This confirms that the PC port was shopped out to another studio. It appears that that studio is Iron Galaxy, the folks that made Jump Kick and season 2 of Killer Instinct. They're also handling the PC port of KI so yeah that's not comforting.
Never even heard of them.
No this isn't "comforting" at all.