I'll put it this way. We know that Lucas tinkers with the OOT soo much because he feels they are not good enough every time he watches them. When TPM had its premiere , he told E! entertainment that he thought the movie was "Perfect". That is what he thinks of his star wars movies, the prequels to him are the ones that he finally got right. All that other crap that came out in 77-83 was just lame special effects. He's a little cookoo ya know. So no, don't expect any dramatic changes to the prequels, not coming from him.