There have been some changes to the widebody FO minimum requirements recently.
JQ now require FOs to have ATPL prior to promotion to WB FO. This will mean the FO can act as PIC and a SO can be on the flight deck while the captain is on rest.
This would indicate to me that they are seriously looking at using SOs in the future... It could also mean they want to remove the restriction of the inability of rostering two non ATPL FOs on a heavy crew.... Time will tell.