Comment: Have they definitely said it would be

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In reply to comment: Some of the technical issues (see in situ)

Have they definitely said it would be

delivery to the door? Somewhere I got the impression that the plan was delivery to local pickup locations, like they do in some places with amazon lockers. So maybe they partner with kinko/fedex locations and stuff like that, and you can order it and go pick it up within the hour. Much more feasible, and still pretty cool, and in a city they'd have no trouble finding enough places to be drone dropoff locations that you'd be able to pick your packages up within a few blocks of your house.