The retail sales info will hit at 0030GMT Tuesday 5 February 2019

  • expected 0.0% m/m, prior 0.4%

Via ANZ:

  • Anecdotes point to a weak December sales pulse. We also think that traditional December sales are continuing to be dragged forward into November. So a modest decline in retail sales for December seems likely. This still leaves nominal sales up 0.8% for the quarter, which likely translates into a somewhat larger gain in volumes than that seen in Q3
retail sales Australia at 0030GMT Tuesday 5 February 2019

I think ANZ's comments are pretty spot on, weak pulse, sales dragged into Nov.

Note that the data will also be accompanied by retails sales for Q4 as a whole.