Last week I read a post about 2001: A Space Odyssey published on TheFilmStage.com. In summary it said, "According to Douglas Trumbull, special photographic effects supervisor for the movie, Warner Brothers discovered 17 minutes that were cut from 2001 by Kubrick after its premiere in 1968, buried in a salt-mine vault in Kansas. (!?)"
Some shots from the “Dawn of Man” sequence, of Frank Poole jogging in the centrifuge, Poole’s space walk before he is killed and a scene where HAL severs radio communication between the “Discovery” and Poole’s pod before killing him and as well as an entire sequence of several shots in which Dave Bowman searches for the replacement antenna part in storage were removed for the general purpose of pacing.
A few days later Warner Bros responded with this statement,
“The additional footage from 2001: A Space Odyssey has always existed in the Warner vaults. When [director Stanley] Kubrick trimmed the 17 minutes from 2001 after the NY premiere, he made it clear the shortened version was his final edit. The film is as he wanted it to be presented and preserved and Warner Home Video has no plans to expand or revise Mr. Kubrick’s vision.”I share the thoughts of Nick Newman, the author of the post: An extended cut will hurt the original's legacy, but these deleted scenes are now a part of cinema history & we'd like to see them in a future home video release of the movie.