That is actually very reasonable of them.At the moment they only say...
As we have now set the cut-off for places for the Main Round of offers, we can calculate what you will require in your interview in order to be offered a place. When considering your results to date (academic rank and UMAT), your chance of being offered a place in the program after your interview - assuming you will have achieved the maximum interview score – is around X%.Please think strongly about this when considering the time, effort and money you will need to invest in order to attend the UNSW interview.
But I'm not sure if they will send out a more detailed one closer to the timr
Would you like to push your luck and ask what the mean interview score is to date? this would be very interesting information.
I suspect a grad student has written some code that works this all out. I hope they have the confidence intervals correct