Since they actually announced they were going to put them on sale to the public, I imagine they have some set aside for pass holders (the initial batch) and then they open it up to everyone on Friday.
If I were them and I theoretically sold 10,000 passes a year, I would set aside x-amount (let’s say 4,000) for pass holders and leave aside the remaining amount (in this example 6,000) for the general public. Come Friday, the floodgates open and ALL my remaining stock goes on sale. So if I only sold 2,000 to pass holders, I put 8,000 up for sale on a first come, first served basis.
But that’s just me.