Apparently, it’s going to have a cinema release in Australia but will also be on Acorn TV eventually. The dates seem weird but this is also from Wikipedia so take it with a grain of salt:
Miss Fisher and the Crypt of Tears will have its World Premiere at the Palm Springs International Film Festival January 4, 2020. The film will then be released in Australia by Roadshow Films February 27, 2020 and will screen in the US in select theaters and on streaming service Acorn TV in March 2020.
Miss Fisher and the Crypt of Tears – Wikipedia
I just want to see it because the trailer looks wonderful. Seriously wonderful. And with most (all?) of the main cast too.