I think CBS might wait for some spring ratings before they got an inkling on what to do. Either negotiate with ABC studios for another season or order an additional episode to get that 300.
I'm really hoping for an announced final season just so we get enough time to wrap up individual character stories. Plus they can try out more risky stuff since ratings won't be on the forefront.
Edited to add:
Saw this
interview from Harry Bring last Sept (Couldn't believe I missed this).
"Because most all our cast deals are set through a potential 14th season. It Is easy to believe with CM's continued ratings success in season 13 that a pick up for season 14 would launch with a BIG 300!"
What does "most all" means?