Things like cutting out extra lines added for the DVD, the extra podrace lap, and air taxi scene.
For AOTC, just cut the few lines that were added/changed.
This would be the preceding for MagnoliaFan's Pre-ANH edit. Getting as nickpickingly close to the theatrical versions as possible. I believe what we already have for ESB and ROTJ is 100% theatrical, so nothing to worry about there.