Hi,
There has been a lot of talk recently in my organisation about the Spotify model and although we are not going to follow it exactly by the sounds of things there are a lot of similarities such as charters and tribes etc.
However the one thing that hasn't been mentioned is who the Product Owners such as myself will report to as a line manager. I currently sit within the 'business' (as oppose to the IT dept) under my boss who is a Digital Innovation Officer, but these roles are being replaced by a 'Tribe Leader' within the IT Department.