Of course, by "Pathfinder 2e" I mean the new version of Pathfinder that has currently been released by Paizo for playtesting; Version 1.6. The type of answer I would prefer is an unordered list which lists the primary differences between the two RPG systems from a systemic level. Such as differences in combat rules, class abilities, feat changes, spell changes, etc.
For more information about expected formatting, please check the top answer here.
Play experience with Pathfinder 2e isn't required, I only need a comparison between the system and its mechanics from a technical standpoint. When information changes or becomes available for the Pathfinder 2e playtest, I'll make a new question with a bounty for an update on the mechanics changes when the completed, full version of Pathfinder 2e releases.