according to bill hunt from digital bits, Lucas considered replacing ESB yoda with a CGI yoda.

I think something like that would have garnered a lot more attention among very casual fans.

I don't know how many more home video formats are left, but im sure one of these days he'll do something that will provoke a huge outcry across all types of fans.

I mean, can you honestly rule out Lucas re-editing Han Solo saying "I know"? maybe not while Ford is still with us. But if he wanted to replace Yoda, then anything is fair game.