I'm pretty sure I read a quote from Cameron while the conversion was still in progress about how they were making some changes to the film to make it look more like if he had shot it today using digital technology, so I think the intent here (for better or worse) was to create a new version of the film. Since I'm satisfied with how it looked in 1991, I don't see the need for this, but I guess Cameron did. I have mixed feelings on the 3D conversion (I don't have the UHD version). The presentation I saw in theaters in August looked incredibly flat, to the point I thought there was a technical issue affecting the presentation in that specific theater. The theater looked into my questions but ultimately stated that there was no issue with the presentation I attended. I did just get the 3D disc and I sampled a few minutes here and there, and the 3D effect was indeed far more pronounced than what I saw in the theaters. So ok, great, the 3D is finally in 3D. But then I'm still left with the fact that it's not the version of the film that I'd prefer to watch. There are very few times where I'll opt to watch a 2D version over a 3D version of a movie, but this will probably be one of those rare exceptions. As cool as the 3D potentially is, I'm not sure how often I'll watch it if the feeling I'm left with at the end is "I feel like I'm missing part of the movie."