Regarding TODO item "%Add a separate TRUNCATE permission"

I would like to start a discussion regarding the TODO item 
“%Add a separate TRUNCATE permission” to gain more information.

The new TRUNCATE permission: 
Is it meant to be a general truncating permission on all tables,
schema's like: “I, the DBA give you the privilege to TRUNCATE” 
Or is this a per-table, per-schema truncate privilege.

Could someone provide more information about this?

Thank you.