News from TVShowsonDVD:
Shout! Factory will release Seasons 1 and 2 of Mr. Belvedere in one package together and will be released on March 17, 2009. It will be a 5 disc set with a running time of 660 minutes. It will be released in full screen (4:3) with English audio, just as it was originally broadcast.
No announced bonus material yet (although I have confirmed that at least Rob Stone, Brice Beckham and Ilene Graff have done interviews), and package art has yet to be finalized.