Over the weekend, I was reading the Entertainment Weekly issue for the end of Game of Thrones. Emilia Clark discusses in the article about when she got the script for the last season, doing her initial read through, her reactions, etc. On the flight to start the filming of the last season, she was actually sitting next to Kit Harrington on the plane, but he was waiting for the table read to experience the whole script.
When they came to the end of the script for the last episode, when he realized that Jon kills Dany, there are tears, disbelief, and now, we have video.
The entire series of Game of Thrones is now airing on HBO, as is the documentary Game of Thrones: The Last Watch.