These are the text versions of the FAQs, taken directly from Treadwell's Techdome, which is loaded with before and after pictures, and divided into subsequent parts. Also, there is an official list of changes on the Official Star Wars website.
And here's some information....
(Star Wars Genesis is the Lucasfilm code-name for the prequels)
The script for the first film is complete and will be released PROBABLY around
1998 or 1999..Episode I, II and III are being tentatively called The Clone Wars,
The Rise of Vader, and the Fall of the Republic...technicians began arriving in England
to begin construction on sets and props for the new Star Wars prequel Trilogy, which will begin
filming at Leavesden Studios in the Fall of 1997. The project is of
unprecedented size and complexity and this studio was one of the few in the
world that could accomodate it. GOLDENEYE filmed there a couple of years
ago. The prequel is set 40 years prior to the timeframe of the original
Trilogy. The films have unprecedented levels of digital content (said to
be around 50%!), so they will be in post-production for a phenomenal
year-and-a-half each. This neccessitates the current 1999 release date
for the first film.
Jabba and Han from Star Wars Special Edition