Well first up it has not been called a BFR for a long time. It is an AFR, look it up.
DCA - CAA - CASA have always been gloriously vague about what should be checked/reviewed so it has varied from school to school. Should be a check in the aircraft you have flown in the most in the last little while and should include theory - load systems - rule changes since last review etc that sort of thing.
http://agencysearch.australia.gov.au...s%2F5_81_1.pdf