Once live, the feature will show up under Settings → Notifications → Lock screen notification minimalism. Code found in the Android build suggests that the feature will also "show fewer ...
If you want to remove the old Images from the Lock Screen Background History in Windows Settings, then this post shows how to delete Lock Screen picture history easily. Here User_Account_Security ...
The option to change and remove your lock screen functions is a great way to make your iPhone fit your needs, and I'm sure it will help stop people from accidentally turning on their flashlight.