The 40th Anniversay Edition box contains 2 DVDs, one with the film (parts I and II) and the other with some interesting special features, such as a much earlier black & white film made on another episode of the adventures of the Monkey King (the "Flaming Mountain" episode). The "Flaming Mountain" is really funny because it is halfway between Disney's (Micky Mouse) animation and the "true" Chinese animation achieved in Uproar in Heaven-- a really strange mix! The sound and image on the DVD is very well-remastered despite many minor specks and scratches, but part II of the main film was badly preserved with nasty marks and jumpy cuts. I really liked the commemorative documentary which has interviews of a few original animators and voice actors when they were still alive-- the Jade/Heavenly Emperor is actually modelled after the chubby face of its voice actor! Unfortunately, ONLY Chinese (traditional & simplified) subtitles are provided.
P.S. A REALLY well-remastered DVD is the 25th Anniversary DVD of "Nezha Nao Hai" (Nezha Conquers the Dragon King) which comes with (Chinese &) English subtitles! It totally wipes the floor with Disney's Mulan (just my personal fanatical opinion) in terms of Chinese fantasy art and, of course, kung-fu animation.