First of all, you can bet from now on that almost all cadets will be going to QANTASLink (EAA or SSA). There may be a couple that go to the existing employers (Air North, Skippers, ******, Jetstar Asia, O'Connors), but given that QL is recruiting like mad at the moment you can bet that they will be taking on the lions share that come out of this "new" QANTAS training organisation.
Wages for these employers range $40-50k. About 50 for QLink FO.
Second, you won't be getting 500 PIC through the placement. Generally, FO time is logged as Co-pilot, with ICUS when you undergo command training. In theory, you could leave the program any time you like and apply elsewhere in the industry, but unless you had a heap of PIC before going into the program (before doing an IR?), I don't think you'll have much luck.
Hope this is helpful - there is plenty of info through other threads, but the program is about to change significantly in terms of numbers through and training providers, so there might be a bit of "lag" in info.