I remember that when Elizabeth was crowned, the coronation was shot on film, which was developed in mid-air on a UK forces jet as it flew to North America. The film was then delivered to a Canadian station and broadcast throughout our continent. Nowadays, I would certainly expect live coverage will be available globally, but so far I haven't seen word one about covering the event from any US broadcast network.
I also recall the late Richard Dimbey's somewhat florid narration of the coronation film. i wonder if we will have one standard universal English-language narrator this time? If so, I wonder who that might be?