1. as posted on this very thread Coleman and Lucas have stated NUMEROUS times beforehand they are not touching the Yoda in Ep 5 6
2. Lucas was so impressed with the Yoda he tried to nominate the ESB Yoda(Frank Oz) for an Oscar, (will Lucas change his mind that dramtically)
3. People on here are long time fans of the franchise and I dont think one person has said even Lucas will go that far and CGI the Yoda.
4. Some of the older fans will be pissed off with Lucas if he does that,(that are on his side now)
5. The people who did the Yoda Stuart Freeborn and Frank Oz may be pissed with Lucas if he does that, and Oz has stuck with Lucas for 5 films.
My gut feeling tells me Lucas will release the Holiday Special before he CGIs the Yoda