Optional. Part of the "rear seat entertainment system". I don't believe they were screens on the back of the front seats, though. I think it was still a single screen mounted on the headliner at that time.
The entertainment system was actually standard in the lower trim but it's not built into the seats. It's a mini van style center screen positioned behind the sun roof.
like the previous comment mentioned with the higher trim ironically the pano roof ends up deleting the video entertainment feature.
You would think being a higher trim it would just move it to the head rests or something.... but nope.