Batman: Arkham Asylum has seen the release of its first patch on the PC today: version 1.1. It hasn't been made exactly clear what's included, though according to a couple of file hosting sites, it enables NVIDIA's PhysX technology.

As for any other inclusions, we can't say for sure, but at 270MB, perhaps this includes the "Insane Night" DLC, which itself is 116MB on the Games for Windows LIVE Marketplace. The latest edition of PhysX clocks in at ~40MB, meanwhile, so there's still some room left for more goodies.

In any case, you can download the update on FileFront or GamersHell.