My teacher predicts that it'll be on post-1945 rather than Aboriginal Spirituality since it's been AS for the past two years, especially because of the 2016 census and increased secularism. As for predictions in short answer and essay, the CSSA trial is a pretty good prediction (since idk which religions you do), but basically whatever topics were last year you can expect that it's less likely they'll do a repeat (and look at previous years as well to see if there's something they haven't covered recently)
I just did a bit of a trend check for the past 6 years (2010 -2016) and they've basically done everything except
account for the present religious
landscape in Australia in relation to:
Christianity as the major religious
tradition
immigration
denominational switching
rise of New Age religions
secularism
I feel like they're going to give us a quote regarding the 2016 census and ask us to give reasoning for it and talk about trends maybe??