This has been discussed many times before. See http://www.australianfrequentflyer....flyer-program/qantas-double-scs-38263-85.html
In my experience double status credit offers arrive 3 months before expiry date. I expect to receive one in 1 month from now, but I will retain WP (just) without it if my sums are correct.
I've just hit Gold for First time and have a good shot at Platinum ( Renewal October 1) , just one catch i need a DSC offer! I hope the DSC lottery is kind to me this year.
AFF Supporters can remove this and all advertisements