The Witcher 2: Assassins of Kings - Enhanced Edition is the Xbox 360 version of The Witcher 2: Assassins of Kings and features new content not available in the original release. However, a Windows re-release with the same content is also available. Owners of a previous Windows release can download the new content for free.
The new content is:
A new intro cinematic
An extended final act with new areas and quests
An extended epilogue which shows the consequences from the player's decisions
All previous patches and DLCs from the PC version are also included. The most noteworthy additions are:
A new tutorial and two new quests
The new "Dark" difficulty which is pretty much the same as "Insane" with the possibility to save. There is also an exclusive armor set to find.
An arena mode which is played outside the regular game and puts Geralt against enemy waves. There is an online ranking list.
Also included is a set of physical (retail releases) respectively digital (download releases) items: