Despite being listed on FFG’s up coming page since July 2011, the Tannhauser Revised Edition Rulebook is unlikely to be rereleased as a stand alone product.
A statement form FFG customer service has been posted on BBG by Brian A.
“We are probably not going to reprint the revised rulebook, as it is available as a PDF and in the current copies of the Tannhauser base game. If you don't wish to print it out on your printer, you could have it printed at a FedEx/Kinko's or other copy center. Otherwise, the only way to get the published version is by purchasing the base game. If we do decide to reprint the rulebook, you will see an announcement on our Upcoming page. Thanks and have a great day!”