I would not at all be surprised if the execs are keeping all the high-profile people out of these loops so as that they can say that they had nothing to do with it.
Wouldn't be the first time either.......
I think chances are that GL has already started looking at what he could do to Yoda in V and VI. Although of course if he does actually go ahead and do it, I for one would be very sad that GL has thrown out part of the so-called magic of film and replaced it by digitilization. Of course CGI is good but it should only be used to supplement what is actually there. CGI will never be able to look as real as any model, never!
If I were a religious man I would pray that GL stops tampering with these films, since he is destroying the legacy he helped to create.
May the force help him.....