Updating my device to build 10-06 I've noticed a couple of strange things linked to the security settings page (I've done a Factory reset before updating the device):

1. Unknown source is disabled
2. There's a App Op option in the Security menu

While the first item it's a bit strange for a device used with most of the apps coming from sideloading, the second item is quite interesting.

The App Ops menu is a cool feature but it's not really something you expect to get as it was only available in v4.3:
App Ops: Android 4.3's Hidden App Permission Manager, Control Permissions For Individual Apps! [Update]

and then removed by Google in v4.4.2:
Google Removes Vital Privacy Feature From Android, Claiming Its Release Was Accidental | Electronic Frontier Foundation

Is this something included in the built on purpose or is there just by mistake?
BTW, if you try to change the permission of the Data Analytics app it crash if you're not using English as your input language (tested with Italian and German):

What did you get with "App Ops"? you can fine tune app permission removing some of them:

~Pietro