I listened to the ending press conference. Interestingly, Demis Hassabis discusses AI ethics twice, saying that development will be largely open-sourced to ensure that AI "is for the many, not just the few." So, this gives the impression that Google AI ethics is more thinking along the lines of 'AI based economy renders many unemployed' rather than 'hard takeoff destroys humanity', or at least that is what they are publicly discussing at this time.

On a lighter note, one reporter asked IIRC "How many versions of alphago are there, and how long does it take to clone alphago?" as if alphago was a living thing that could be cloned like a plant, but which took time because it had to be grown and nurtured. Perhaps it was an error in translation from Korean, but it really did seem like she thought that alphago was alive. This rather confused the deepmind people answering the question.