The package includes (from the official announcement):
A clubNAMCO Exclusive. The Dark Souls clubNAMCO Edition bundle comes with the standard edition of the highly anticipated Dark Souls, an exclusive printed map of the land you will be roaming and an American Apparel Dark Souls T-Shirt — The softest, smoothest, best-looking T-shirt available anywhere. 100% cotton construction.
It is scheduled for release October 10th for Xbox 360 and PlayStation 3 priced at $79.99.
EGM’s TAKE: If you like exclusive limited editions then you can’t go wrong with this one.
Source: Namco Bandai