Batman: Arkham City. WB confirmed the existence of the bundle (due on October 21) for that region in a press release, including the single image above of the layout.
The CE includes a Batman statue by Kotobukiya, an artbook, a downloadable soundtrack, early access to the "Iceberg Lounge Challenge Map" and a Dark Knight Returns-style skin, and a copy of the Batman: Gotham Knight animated movie.
Americans suffering from envy of that exclusive swag (if not the game disc unceremoniously tucked into a paper sleeve) shouldn't worry; the details of this UK bundle match up with those posted last week by GameStop. We'll just have to brood in our caves for a bit -- we're sure it will be made official for North America soon.
Update: Warner Bros. has confirmed that the collector's edition is slated for the US as well.