Stumbled upon this today: https://community.fxtec.com/topic/3292-pro1-and-pro1-x-design-change-to-use-snapdragon-662-no-new-devices-before-august-2021/page/2/

While the switch to the Snapdragon 662 is unlikely to negatively impact LineageOS and Ubuntu Touch (I hope), it‘s likely a major bummer for the mainline Linux story, which was looking quite good with the 835. #fxtec #pro1x