Basically it's Dragon Ball Z more faithful to the manga. Like what Fullmetal Alchemist Brotherhood is doing, the shape ups to the Dragonball series is getting me exited. I've been a big fan of DB for a long time now, and I've always thought that some things in the DB universe were a bit...strange.Toei Animation has confirmed that Dragon Ball Kai will be edited to more closely follow Akira Toriyama’s original manga. The Dragon Ball Z anime series originally ran from April 1989 to January 1996 in Japan. However, since Toriyama was still serializing his manga at the same time in shorter weekly installments, the Dragon Ball Z anime expanded its story by inserting additional content. The new Dragon Ball Kai remastering will be an “Akira Toriyama original cut edition” that will quicken the story presentation and adhere more with the manga’s story. Toei has said that they are planning on cutting the series down to around 100 episodes.
YouTube page (with the new intro!):
http://www.youtube.com/user/dbkaihd