This new release has audio commentary by veteran science fiction film journalist Gary Gerani, and interviews with several industry professionals. They're also throwing in the documentary Ray Bradbury: American Icon, which was first released in the late 1980s or early 1990s.
Ray famously said that this miniseries was "boring", and he was heavily chastised by NBC for saying it. He wasn't entirely wrong. But the announced extras should make this a very collectable release.
It's a limited edition set, and I understand that it will be region free. I've placed an order, and found that they do ship to the UK (with added shipping of about 30 Australian dollars - which is about £15 in UK money). It's released at the end of September.
Ordering information is here: https://viavision.com.au/shop/ray-bradburys-the-martian-chronicles-1980-imprint-television-5