Right from the dawn of the space age, we've been led to believe that there's an inevitable communications blackout during reentry. This has led to many anxious moments. Today we've just seen that communications are possible "all the way down" if the vehicle is big enough and the communications equipment is suitably placed. That's actually game changing, but In the excitement of the today's successful launch, no one seems to have pointed this out.
Congratulations to everyone involved. I've no doubts that at long last we are on our way to Mars, and that Mars will be populated way before the end of the present century.