http://www.tvshowsondvd.com/newsitem.cfm?NewsID=3636
Warner Bros has revealed plans to release Batman: The Animated Series Volume 4 before the end of the year. The fourth volume in the series will include the 24 episodes of Batman: Gotham Knights, the series that began in September '97. We expect it to be released in December, though the studio hasn't made a formal announcement, and likely won't for at least another 3 months.