There's only been one DVD release, and it sucked balls. I'd hardly call it a special edition. It's full-frame (matted for theatres), with zero special features (oh, sorry there is a trailer... BFD). The transfer is decent but nothing great. It's also not a director's cut. It's the same old version. It is very explicit, but so was the original movie (I believe it's still banned in the UK).
The only reason I own the DVD is because I love the movie so much. However, new editions of all the Kubrick films (well the ones in the box set anyway) have been announced, so if I were you guys I'd hold off until they're available.
l2c