While no official release date for the Eclipse DVD has been confirmed by Summit, VideoETA.com posted yesterday that the film would be released on DVD and Blu-ray in the US on December 4:
Summit will be releasing two versions in both DVD and Blu-ray formats. There will be a movie only version ($28.99 DVD / $34.99 Blu-ray suggested retail) and a feature-laden 2 Disc Special Edition ($32.99 DVD / $40.99 Blu-ray suggested retail). The 2 Disc Special Edition Blu-ray will also be a combo pack containing both DVD and Blu-ray versions of the film.
The special features are listed below:
DVD/BD Special Features (2-Disc & BD/DVD Combo Disc only)
2 Audio Commentaries: Rob Pattinson & Kristen Stewart; Stephenie Meyer
Deleted and Extended Scenes
6-Part Making of Documentary
Jump to… Your favorite scenes
PIP Commentary (BD only)
The DVD doesn’t seem to be available for preorder online yet, so I would consider the December 4 release date as a rumor at this point. However, it appears that HMV and Amazon UK have confirmed a UK release date of December 6 (which would make sense with a December 4 release date in the US, but could always be changed). Click on either of the links above to preorder the UK version from those websites.