OK... I can confirm that you need to be a WP/OWE and travelling that day or a J pax to enter the new lounges.
Arrived at BNE QP with my WP card (which admittedly had expired and QF havent sent me a replacement yet

) ready to gain entry with my guest travelling on JQ.
Was told rules and was then offered to use the QP as I, as the WP member, was not travelling today.
QP was packed as per usual, however you can view the Jlounge through a little window from the QP and it also looked reasonably full.
My guest had never been to a QP before and couldnt believe that airports had these lounges... she thought it was heaven!!

<-- actual look I gave her!
Chooms