Ron "Keeper" O'Dell says that Tiny Toons will be coming to DVD next year, and this Earl Kress post would seem to back him up, obliquely.
Oddly enough, O'Dell's source says that Animaniacs volume 4 isn't currently in production; whether that means it's been stopped, or just that it won't come out until the first volume of Tiny Toons, I don't know. (The last 24 episodes of Animaniacs are mostly disappointing but they do contain some good cartoons -- like "Back in Style," a Tom Minton script similar to and just as good as his famous New Adventures of Mighty Mouse cartoon "Don't Touch That Dial.")
The Tiny Toons episodes were aired in a weird order and I have no idea which order they'll be in on the DVD; we're likely to get 24-25 episodes, but which ones is another question. They will include at least a few of the earliest-produced episodes, with contributions from Bob Camp, Jim Reardon, Eddie Fitzgerald (who actually stuck around for much of the series) and even John Kricfalusi (he designed a character, uncredited, for the episode "Who Bopped Bugs Bunny?"). There was a struggle between the non-drawing writers and the artists or artist/writers who had been drafted from The New Adventures of Mighty Mouse; for better or worse, the scriptwriters won pretty decisively as the series went on.
Hopefully the first volume of Tiny Toons will sell well, as future volumes will have some substantial music costs and Warners will have to be willing to spend more money on them. (I'm referring to the two music-video episodes, which used They Might Be Giants, Aretha Franklin and the Coasters among others.)