Just got off the phone with Guest Services. I was informed of the below:
My current Platinum Pass Certificate will be honored as purchased, so will still include MM (I paid $925 for this AP Cert so I'm relieved!). However, because it is a certificate and NOT a pass or ticket, I will still be limited to 3 park reservations until the certificate is redeemed. I will be able to make another 2 park reservations at time of AP Activation, for a total of 5 for the trip as a non resort guest.
My son's 6 Day Park Hopper Ticket can be upgraded to an Incredi-Pass AP either at time of launch (Sep 8th) or prior to our last day in the park (we visit in Oct). There is no benefit to doing one over the other. They will apply the value paid of his current 6DPH ticket to the new Incredi-Pass AP at time of upgrade, and I would simply pay the difference.
I'm really bummed that the new AP is so expensive and there is no lower tier to upgrade into like at DL. This basically means I'm going to have to really do the math before my trip in October to see if its worth it to upgrade my son to the AP, or just get him 2 separate tickets for the trips we will be taking over the next year. But, I was on the fence about renewing in 2022, now I'm pretty sure I won't. We vacation to so many other places, there is no reason for me to spend $2000+ on themepark tickets for 2 people when I could pay for us to go to Ireland for a week with that money!
Next time we go down, my son will be older and taller, and we will probably skip Disney all together and just stay and visit Universal.