J. Michael Straczynski, creator of Babylon 5, has let it slip in a Usenet posting that the Season 1 boxset planned for Nov. 5th will tentatively be followed up with Season 2 next April, and Season 3 the following November. Assuming that the second set is late in the month, it looks like Warner Brothers is planning on a six-month rotation for getting these out. You can read the post yourself, at the JMS News archive site
here.