That rumour gets trotted out from time to time. I'm not sure how JQ can do that an still manage to crew the 787 operation....unless they're prepared to pay QF rates of pay in which case you may as well give the aeroplanes to QF.
Keep in mind too that QF is currently wearing significant costs of crew sitting around doing nothing due to having lost the aircraft to J* to start off with. It'd be nuts to keep them doing nothing (but still paying them full QF rates) whilst also paying the J* pilots to flog the aircraft around domestically.