For those with an account, there are three setting groups (above) used to control it. For starters, the "sign-in & security" card lets you manage how you sign in and control devices and apps. Running through the new security setup wizard will let you see and modify your passwords and two-step security controls, then verify all your phones, computers and tablets. You can also tweak apps that use Google security, many of which (if you're like me) you may have forgotten about.
The second set of settings is for privacy control. Did you know that Google can go ahead and feature your publicly shared Google+ images as a background for its products & services? Well, now you do, and Mountain View lets you tick a box if you want them to cut that out. You can also control whether Google shows your app reviews on Google Play, how you share YouTube videos and how you're served ads, to name a few other settings. The final "account preferences" card lets you change your language and input tools, adjust Google Drive storage and delete accounts or devices.