If it's a new pass, it shouldn't expire until 1 year after the first day you use it to get into a park. If it's a renewal, it will be one year after your previous expiration date. I expect the expiration date you're seeing is misleading and not something you'll need to worry about.
It's a new pass, as my last AP expired a couple of years ago. I'm thinking/hoping this is the case, and is just the time period in which I can currently make park reservations. I'm going to try to confirm this, though. I also did not see any overall expiration date for the "voucher" which the old APs used to have.
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