No one really thought WB Games wouldn't be releasing a Collector's Edition version of Batman: Arkham City in October. It's just good business: give the people what they want, only add in some extra goodies to make it more expensive. We now know what those goodies will be, thanks to a handy product page update on Best Buy's website.
The $99.99 Collector's Edition package contains a "premium statue" by Kotobukiya (no picture), an art book, "animated content" from the animated anthology release Gotham Knight and early access to the game's add-on content "before anyone else."
Source: Best Buy