If someone on here has access to Qube Res system you will see that many people travelling on staff travel from within the QF network have a 50Y/***** category which means they get on before you.
Even without this new UPGRADE status you quite often find as a LAME you have the best upgrade status but the lowest onload of the people listed for the flight.
It's all in the staff travel policy manual
50
STAR Program
Group A - Current Staff
This priority is for employees travelling with or without their spouse (or Travelling Companion) and children on "Normal Rebate Travel".
51
STAR Program
Group A - Current Staff
This priority is for spouse (or Travelling Companion) and children of employees travelling without the employee on "Normal Rebate Travel".
So if the employee is travelling you will always be N50<staff member YJ<economy and business class 15<lame upgrade priority 88<start date
so N50YJ1588 would be how your ticket is read. Onload priority is based off type of ticket N50<normal staff travel ticket, N42<High Priority Trip etc, then your start date if you are both N50's for example.
The date of joining (DOJ) is the date on which the employee was appointed to the Company adjusted by any unpaid leave days which do not constitute service days. It compliments the Travel and Upgrade priorities to determine onload, offload, upgrade or downgrade between 2 passengers with the same Travel priority.
simple