ANH

- coming to Mos Eisley (but I prefer the 2004 re-make)

- the added Jabba scene (again I prefer the 2004 re-make)

- the added Biggs scene

ESB

- the added Wampa scenes (but they could add the COMPLETE Wampa subplot)

- the new Cloud City (but unfortunately they made that stupid continuity error)

ROTJ

- Luke doesn't stand above a huge butt hole anymore, but above a dangerous looking monster (Sarlacc)

I can't comment on the audio changes, because I have heard in both in cinema and on VHS only in Czech