page manager is fairly stable right now after one month of public usage and debugging. That's great and it's time to add proper docs for everybody so that you guys do not rely on forum posts to learn about it.
With three relatively close releases we foced people to manually update Sitecake three times, which is a pain in the ass, so we decided to make this process more user friendly, automated. Similar to the auto update process Wordpress has, with the option of auto rollback in case that you need one.
Will keep you posted with the progress!