BradyGames’ Batman: Arkham City Limited Edition Strategy Guide includes the following:

Join the Dark Knight as he soars into Arkham City, the new home for all of Gotham City's thugs. The sequel to Arkham Asylum brings together an all-star cast of heroes and villains.
-Different Pearlescent Collectible Covers!
-Numbered lithographs featuring exclusive artwork.
-Centerfold featuring Harley Quinn and Catwoman!
-The walkthrough chapter covers how to subdue the villains attempting to stop Batman. It reveals the ultimate path through each level and the best tactics to employ.
-Learn which gadgets work best and how to deploy them for maximum effect.
-Area maps detail all the available item locations.