Hey Darf, it's great to hear that you're still looking forward to these. I really hope that these releases live up to your expectations! I've been having technical problems getting my new connection up and running but it should be good to go very soon, fingers crossed.
As for the three Lord of the Rings films, while all three have been regraded (both The Two Towers and The Return of the King have green tints as well, but to a far lesser extent that Fellowship of the Ring), only Return of the King has been edited, and that's only slightly. I made three small changes.
Firstly I removed the scene at the start of the second disc with the corsairs and Peter Jackson being hit and killed my Legolas's arrow for two reasons: 1) It's very silly in a geeky sort of way, killing PJ and Gimli's 'oops' reaction (all the pirates on the deck are actually important crew members getting cameos like PJ so it draws you out of the film as well IMO) and adds nothing to the film and 2) It steals most of the thunder away from the climax of the Minas Tirith battle when Aragorn arrives at the last moment with his army of undead on the ships if we've already seen Aragorn and the undead army getting on the ships beforehand.
Secondly I edited the confrontation between the Witch King and Gandalf so that Gandalf doesn't get his staff broken and knocked off his horse, the Witch King is about to swing his sword at Gandalf when he gets interrupted by the Rohirrim horns and flies off. The reason I changed this was because I always felt it was too over the top to have Gandalf's staff broken and falling over in a heap in the movie. It makes Gandalf seem much weaker than the Witch King when in the books Gandalf and the Witch King seem evenly matched and it ends in a stalemate.
Lastly I edited the scene with the Mouth of Sauron to remove the bit where Aragorn beheads him because it totally goes against the nobility of Aragorn's character in the films. The Aragorn from the books would never kill an enemy ambassador that has come to parley with him, however evil he may be, it is simply not done. If I remember correctly, the Mouth of Sauron is allowed to leave unharmed in the book. The same thing should have happened in the film, so I edited it so it seems that he's been allowed to leave unharmed.