We do not know what it is; it could be an expansion for XCOM: Enemy Unknown or a different title for 2K Marin’s upcoming third-person shooter, The Bureau: XCOM Declassified. It could also be for the mobile/tablet versions of XCOM: Enemy Unknown that were announced earlier this year, though this is highly doubtful.
The classification for XCOM: Enemy Within appeared yesterday on South Korea’s Game Rating Board. The game is listed as being for PlayStation 3, Xbox 360, and PC. The rating is 18+, as in not-for-kids.
XCOM: Enemy Unknown was developed by Firaxis Games and published by 2K Games for PlayStation 3, Xbox 360, OS X, iOS, and PC. The Bureau: XCOM Declassified is being developed 2K Marin and will be published by 2K Games for PlayStation 3, Xbox 360, and PC.