In Germany they are playing the PT in a form of HD, but the compression seems to be in a format where hardware to record is scarce. Previous discussions on the German HDs:
http://originaltrilogy.com/forum/messageview.cfm?catid=9&threadid=4949
http://originaltrilogy.com/forum/messageview.cfm?catid=9&threadid=4624&highlight_key=y&keyword1=hd
Revenge of the Sith has been "On Demand" since the beginning of the year in what i'm assuming is HDTV, haven't heard any reports of differences in this version.
none
(rev'd OT to PT)