i am ahuge terry pratchett fan and i heard that hogfather was out, is it going to be released in australia?

Far be it from me to usurp the role of a Sweeper, but this should be in 'The Death Books' section.

As to Hogfather, I understand it almost certainly won't be on TV, though you should be able to get the DVD.

from Discworld monthly -

In related Hogfather news I've heard a rumour that Hogfather will be
released on DVD in Australia in early December. Having checked a
couple of on-line DVD suppliers based in Australia I have found that
they are listing it as available for pre-order.