This 20th Anniversary Blu-ray Book Edition appears to be a repackaging of Warner's previous Unforgiven Blu-ray; it presents the film in its 2.39:1 original aspect ratio with a 5.1 Dolby Digital audio track and the following special features:
Commentary by Eastwood biographer Richard Schickel
All on Accounta Pullin' a Trigger featurette
Eastwood…A Star featurette
Eastwood & Co.: Making Unforgiven featurette
Eastwood on Eastwood career retrospective
Maverick TV series episode "Duel at Sundown" (1959)
New to this release is a "54-Page Commemorative Blu-ray Book With Photos, Production Notes, and More."
Unforgiven: 20th Anniversary Edition streets on February 21st, 2012.