Just checked the WorldTracer website as provided to me by the airport and this is the latest update:

FORWARDING MESSAGE

FROM: HEATHROW-LONDON
TAG NO: AA273864
ORIGINAL FLIGHT: QF006/16JUN/
NEW FLIGHT: QF032/19JUN
NEW ROUTE: SYD

Please note:
Flight dates shown are departure dates from the specific location(s). Forwarding details are subject to changes due to unforeseen circumstances such as: flight irregularities, security checks, etc.

Please be assured you will be contacted when the baggage has actually arrived.

The tag number matches what I’ve got on my ticket so it’s looking good! My bag went to London without me! Hope it enjoyed the trip ;)