From their website:?
The Tannhäuser Revised Edition Rulebook improves upon the innovative mechanics of Tannhäuser. This 96 page perfect-bound book is intended as a comprehensive replacement to the original Tannhäuser rulebook; it includes revisions to the core game rules, as well as those originally found in the Operation: Novgorod expansion, along with the Wolf, Yula, Gorgeï, and Ramirez single figure packs.
In short, it includes all the rules players will need for any Tannhäuser product currently available. What’s more, players who already own a copy of Tannhäuser needn’t worry about their game becoming obsolete; the Tannhäuser Revised Edition Rulebook utilizes current Tannhäuser components, and requires no additional purchases.