Your best bet is to register and vote for the shows at
TV Shows on DVD and sign up to be notified by e-mail when there is any news. They're always among the first to get information on these items, often
the first, and the notices go out very quickly. (I got a notification earlier this year on the release of a show I had been waiting for so long that I had just given up on it. I had forgotten even signing up on the site for e-mail notifications until the message with a news update finally arrived.)
Regards,
Joe