Please let this be true but as always all is just rumor until we get official confirmation.
VideoETA are reporting that the 'Eclipse' DVD commentary will have both Rob and Kristen as well as Stephenie Meyer!
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)
Again all rumors but i sincerely hope this is true! The Twilight commentary with them both is one of my all time favorites.
Source Via RPLife