According to VideoETA.com Rob & Kristen are doing the commentary on the "Eclipse" DVD.
It hasn't been confirmed yet but VideoETA are a pretty reliable source. Exciting Huh??
Here are the Deets:
Release Date: Dec 4th 2010
Synopsis: It all begins… with a choice. In the third chapter of Stephenie Meyer’s phenomenal Twilight saga, Bella Swan is surrounded by danger as Seattle is hit by a string of murders and an evil vampire continues her quest for revenge. In the midst of it all, Bella is forced to choose between her love, Edward Cullen, and her friend, Jacob Black—knowing that her decision may ignite the ageless struggle between vampire and werewolf.
DVD/BD Special Features (2-Disc & BD/DVD Combo Disc only)
2 Audio Commentaries: Rob Pattinson & Kristen Stewart; Stephenie Meyer & Wyck Godfrey
Deleted and Extended Scenes
6-Part Making of Documentary
Jump to... Your favorite scenes
PIP Commentary (BD only)