As I understand it, this was an ambit claim from the company that was quickly dismissed by both parties early in negotiations. I'm sure the company would like to have it revisited along with a 20% pay cut, reduction in allowances, loss of pay protection etc etc.
This dispute was mostly about the job security clause and the company have made enough public statements to verify that was the sticking point. I think that's the central issue FWA will rule on. I very much doubt they will start stripping away existing entitlements, at least I hope not.