I'll just post my list here. :B
The main people releasing Tezuka's stuff in Australia/region4 are . They do a pretty good job of it and have a fondness for obscure things.
FROM MADMAN
Astroboy (1960s - in the form of two deluxe box sets)
Astroboy (1980s - in the form of one deluxe box set, a non-deluxe box set and/or individual DVDs)
Kimba the White Lion (1960sboxset and individual DVDs available)
Jungle Emperor Leo (the Kimba movie)
Space Firebird 2772
The Experimental Films of Osamu Tezuka (...fondness for obscurity indeed)
Blackjack (movie)
Madman has also released the new Astroboy manga under their brand.
FROM SONY
Metropolis
Astroboy (2003)
Those are all I know of... I'll update you as I find out about others.
Australia Correspondent Mamath signing off! xD