Something I overlooked back when the set extras were first announced, is that Madman have put up a preorder page for their Beast Wars Season 1 DVD (Region 4 PAL) and a release date as 15th March 2006 with the following CONFIRMED extras

World Exclusive Audio Commentaries with lead writers Bob Forward, Larry DiTillio and series authority, Benson Yee
Interviews with Bob Forward and Larry DiTillio
16 Page Booklet, including preview of new Beast Wars comic by IDW publishing
Toy Galleries
Toy Commercials
Character profiles
Original Beast Wars Optimus and Megatron 2-pack comic
…and much more!