Although the site cautions that this is a "rumor mill" post only, it does seem promising. I would guess that DVD sets of BATMAN: THE ANIMATED SERIES and SUPERMAN: THE ANIMATED SERIES have sold well enough. Fans of Bruce Timm's animated interpretations of the DCU characters have been thunderstruck at Warner Home Video's marketing of their animated-action stable. Single-disk releases. Poor packaging. A disgraceful "3 episodes" per disk. Looks like they are finally listening!
On a sidenote, JUSTICE LEAGUE UNLIMITED has been amazing the last two seasons. It certainly deserves a lavish DVD treatment. Here's hoping for commentaries and extras!