UPDATE: THEY HAVE PICTURES OF A BLACK HOLE!!!!
EDIT: LIVE NOW, PRELIMINARIES GOING ON AT THE MOMENT. Starting at 13:00 UTC (09:00 EDT) there will be a press conference from the Event Horizon Telescope team. It is assumed that they will be announcing and showing the first images of a black hole event horizon. This should be the YouTube live stream here:
And here is an excellent Veritasium video from a day or so ago explaining what we will likely see. As cool as it would be to see exactly what we expect, it would almost be cooler if it was something completely unexpected.