Codes just came out today, but buried at the bottom of the email is this text (Thanks to JustinMSP for pointing it out):

"We're committed to continually improving your experience. Based on guest feedback, we'll be sunsetting American Airlines systemwide upgrade vouchers beginning in 2025. We're continuing to invest in other ways to provide improved access to and utility of your Alaska Air upgrade benefits. You'll also continue to enjoy eligibility for unlimited complimentary upgrades on American Airlines in North America (based on availability) — no upgrade certificates required."

So I assume this means no more codes next year? I wonder what, if anything, AS will replace it with. Pretty big loss.