According to TFW (who didn't quote or credit a source, so I can't verify this), some release dates for the Bumblebee Movie have been revealed, including Australia, which is claimed to be Thursday December 20th.

IMDB has some of these dates, but not the Australian release date, so I can't tell where they got it from.

The listings note that the UK and France has a release date of December 26th, while Germany and New Zealand have the same release date as us in Australia.

Most previous Transformers movies had their US release date brought forward a couple days to be world-first, so we could still see that happen with this one.
Not that it will make much difference, as this time, there will be a novelisation out about a month before the movie comes out.