OCPMovie only did it for ANH. The commentary is sourced from various interviews, according to the Classic Edition thread. The following speak in it:
George Lucas
Anthony Daniels - C3PO
David Prowse - Darth Vader
Peter Mayhew - Chewbacca
Kenny Baker - R2D2
Mark Hamill - Luke Skywalker
Carrie Fisher - Princess Leia
Harrison Ford - Han Solo
Garrick Hagon - Biggs Darklighter
Ken Ralston - ILM
Dennis Muren - ILM
Ralph McQuarrie - Production Paintings
Charles Lippincott - Former VP, Lucasfilm
James Earl Jones - Voice of Darth Vader
John Williams - Composer
Irvin Kerschner - Director, The Empire Strikes Back
Frank Oz - Yoda, The Empire Strikes Back
Jeremy Bulloch - Boba Fett, The Empire Strikes Back
Matthew Carter - Bib Fortuna, Return of the Jedi