There are plenty of TV shows and movies that people hold near and dear to their hearts. They either grow up on these shows or see them at some point during their lives where they leave lasting impacts. Those memories not only stay fresh in that person's mind, they can also help shape the person they become. Sometimes I think it's hard for creators to realize just how much their works can influence a person.
Just take a look at the Star Wars DVD/Blu-ray re-releases out there right now. The biggest talk about the release has nothing to do with the series itself, but instead, the new round of cuts and edits that George Lucas has called for. These little tweaks just keep building up, and the series that millions once loved is now turning into a different beast in and of itself.
Some anime releases are seeing the same kind of treatment. Whenever a DVD or Blu-ray release of an existing property comes along, there are some changes made as well. Additions like resolutions and audio quality upgrades are always welcome, as those elements being improved can only help the experience. Throwing in 3D support, re-dubbing lines, re-coloring sections and stuff like that can lead to fans feeling slighted.
When a re-release is on the way, what are you looking for? Do you just want to get that anime you love in a higher quality format, or are you interested in the slight tweaks that are made along the way?