While the full Workprint has been removed from youtube by Henson Inc., here is an interview with the fan who put it together:
http://mentalfloss.com/article/54077/watch-restored-original-cut-dark-crystal
Here's a link outlining the differences between versions:
http://lostmedia.wikia.com/wiki/The_Dark_Crystal_Deleted_Scenes_(1982)
And from a Dark Crystal board, a 2014 post with additional details on the workprint plus a claim from a member that "Recently, I was told that a collector owns a copy of the full color workprint VHS tape (Frank Oz voice of Aughra)- some unfinished scenes in b&w. He was granted special copyright by the [Jim Henson Corporation] to convert it onto DVD for their archives."
http://www.darkcrystal.com/index.php/forums/viewthread/26230/#3458

I'm suprised of how well this workprint does.
"Questions Questions too many questions, want shard here!"-The Dark Crystal