The new R-4 DVD (21st anniversary special edition)
I bought this yesterday and have watched it.
Very good picture, minor print damage - the odd fleck, really. Four audio tracks: a new 5.1 remix (mildly immersive), the original 2.0, an English descriptive track and a commentary track from John Duigan.
The major extra is a conversation that Duigan has with Ben Mendelsohn, Loene Carmen and Noah Taylor. Taylor is shot separately from the other two as he lives in England. No subtitles here.
There's also a trailer and an optional introduction from producer George Miller.
Very much worth getting if only to see Duigan promise Carmen that he's planning a third outing with Danny Embling. I'd like to see that.