It is a very different series from the original Batman series. Kevin Conroy returns as an old (and even more grizzly) Bruce Wayne but really fills the Alfred role for Terry McGinnis. He does a great job with the voice work again, just as he did in the original series. The series also has tie-ins with both the original Batman series, as well as the animated Superman series. The time jump is a bit weird because the original animated Batman series looked like it was set in the 1940s or 1950s, and part of this series looks like it was set in the mid to late 1990s with CD Rom and cell phone technology, but then also has flying cars and makes Gotham look like a futuristic Toyko or Bejing. They never do nail down when it was supposed to be taking place, and all the showrunners said in the bonus material is that it was set 50 years after whenever the original series was. There is no actual series finale in this set. It just ended with a regular episode. The real wrap-up to the series was done on an episode of Justice League Unlimited, which actually aired after this series but is set earlier in time when Bruce Wayne was still young.
The DVD set is an eight-disc set with three seasons spread across the 8 discs. There are two discs for the 13-episode first and third seasons and 4 for the 26-episode second season. There is also a bonus disc that has a couple other show-specific features and then an hour-and-a-half-long documentary on the history of DC Comics and all that had spanned from it, including the TV series and movies (up to about 2008). The other extras are commentary tracks for some of the episodes, some making-of featurettes, which were interviews with the producers of the show, and trailers for some of the other animated shows and movies. Thankfully, there are no double-sided discs like there were for the Superman series. A good amount of bonus material for what is included.