Can I prove that the prime controllers exist? No. But POS hasn't started yet. Prime controllers don't have anything to do with the network during POW.
Sounds like a hard fork would be needed to put them in place and we have less than 9 hours till the end of POW. Hopefully the network can still function with regular staking until this is implemented. We'll see soon enough.
No hard fork needed. POW just needs to end at the timestamp.