This leather-bound hardcover edition (7 x 10.6 inches, 18 x 27 cm, 48 pages) was produced for the 2010 San Diego Comic Con by Avatar Press (no ISBN, nor cover price but it was sold $70 during the event). It is a signed edition (by both Alan Moore and Felipe Massafera), but not numbered although it has been advertised as a limited print run of 350 copies.
It is printed on thick glossy paper. Below is a picture for size comparison with the original 2009 softcover edition. As the leather-bound version doesn't features any credit page, I have also taken a picture of the credit page of the regular edition.
Both edition shared the exact same content which is Alan Moore's script adapted by Antony Johnston.
And that's it, no bonus or any sort of extra material. In order to be more exhaustive, let's pinpoint the existence of a regular hardcover edition published in 2009, along with a variant cover convention edition limited to 1000 copies.
|convention edition with variant cover|
Some more pictures on the Comicstrade site here.