I heard about those changes too. My opinions.......he should never have changed it from Han firing first as originally filmed. Making either of the "fixes" doesn't change my attitude toward Solo anyways, and the first attempt with Greedo shooting first was so bad, it was ludicrous.
As for changing Anakin at the end of ROTJ to Hayden's face, why would they not change Kenobi's face to Ewan McGregor's face while they're at it?
You can't really use the argument that when Anakin/Hayden turns to the Dark Side, he "dies", so use that image of Anakin. The way I see it, when Vader dumps the Emperor, he "returns" from the Dark Side, and dies as Anakin in the image of that crusty old dude.
Geez, Lucas can be such an idiot at times.