You have to cancel that subscription, and then subscribe again after the release.
The only way to cancel a subscription is to email customer service and ask them to do it. To resubscribe, you only have to click buttons on the website.
Two caveats
a) right now, CS seems to have a backlog. I've seen posts that say people sent an email a month or more ago and have not yet heard back from CS
b) if you have a grandfathered AP subscription to the PF2 AP line, you may want to verify with CS that you can resubscribe without losing that older benefit. You may not be able to.