I remember Terence Stamp (who played Chancellor Valorum in Episode I) saying a few years ago that he was surprised how few of the scenes he filmed made it to the final cut of Ep1 - and that there were a lot more politically themed content that didn't make it either.
Perhaps if new scenes are being inserted into the OT, then there is a chance that maybe the PT will also have new or previously unseen shots inserted too...?
(the cynic in me thinks as it has been 8 years since the release of Ep1 Lucas must be itching to make a few changes
)