http://arkhamcity.co.uk/viewtopic.php?f=4&t=4249Evidently Batman AC is the first Unreal Engine 3 to feature DX11 effects

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Thanks to the high-altitude gliding and swinging, the depth effects of 3D really stand out in Arkham City, though it does make a dark game look that much darker. If you've already invested in a 3D monitor and a beefy Nvidia GPU, playing this game will make you glad you did.
Those straying away from the purchase of the console version and deciding to give the mouse and keyboard a go will be delighted to learn the highly praised PhysX engine and DirectX 11 effects will continue to shine. Notes the writer, "Even ignoring the absence of [these PC exclusives] (such as tessellation, fog, and more loose trash in the streets) -- holy crap, do the console textures look poor by comparison."
In [the courthouse battle], the not-so-subtle PhysX enhancement causes a wooden wall to splinter as inmates are flung against it.
An additional combat detail was also mentioned for the first time in the article:
If you happen to be near a wall or rail, Batman transforms it into an instrument of justice by slamming a goon against it.
This new technique is seamlessly integrated into the "free flow" combat system the franchise is becoming famous for much like the cape stuns, takedowns, Batarangs, and throws from Asylum.