I don't know whether anyone's noticed this, but the 2016 serial numbers are now available on the RBA website.
Here they are:
$5: AA16-EJ16; 0000001-4063626; Stevens/Fraser
$50: AA16-DA16; 999999-322672; Stevens/Fraser
Source:
http://banknotes.rba.gov.au/resourc.....l-numbers/