Settings - Security & Location - the gear symbol beside Screen Lock and the Lock screen preferences beneath it. You also have Screen saver and Ambient display in Display. You can always use the search function on the top of the Settings page to search for anything in the system.
I would like to know the same, I do want AOD without clock but I don't see an option to just have a blank black screen.
@Ivan_Meler@ thanks for the new release! Auto brightness is kind of jumpy. In low-light conditions it changes every third second or so to a new value.