I don't think that Lucas will make a new scan of the OT. Technically speaking, there is no reason why he must make a new scan. Some crappy 3D in post and that is basically all we're getting. Look at the Blu ray version of the OT. The new changes just scream 3D. The rock in front of R2's hiding spot in ANH and the new front of Jabba's palace in ROTJ. We will geht another version of Lowry's scan with additional changes. It won't live up to anyone's standards of 3D and Lucas will blame it on the OT's age. And still, people will just walk into theatres because it's Star Wars on the big screen and in 3D.