According to this tweet by GreenManGaming, Batman: Arkham City is not going to be using Games for Windows Live as its DRM:
We've just received notice from Warner's that Batman is Games for Windows but NOT a Games for Windows 'Live' title!
I've contacted @arkhamcitynews, but, so far, I've been given no clear, "official" answer about this. People around the world rejoice. I shed a single tear and head to Amazon to cancel my pre-order. I wanted GFWL :(