The official release date for region 1 is December 17th 2002.It will be released as a box-set with over 10 hours of extra features spread over the 3 films.Commentaries from Robert Zemeckis along with Bob Gale for the three films have already been made. Also Michael J. Fox has done his as well. There will be documentaries aplenty and also lots of deleted scenes etc..Source: http://www.bttf.com/backtalk/20020617.shtmlBoxset picture: http://www.bttf.com/dvd/bttf-dvd.jpg
R4 out in August, with slightly fewer features, but at £17.99 from cdwow - see bargain forums.
Think its time to release Indiana Jones boxset next.