The wreath laying ceremony begins at 1:25 pm ET. Obama will NOT speak. Look for a live stream here.
Update May 4: Obama will participate in a wreath laying ceremony at the 9-11 memorial. He is meeting PRIVATELY with 9-11 families at 1:45 pm ET.
Update May 3: Obama graciously invited George Bush to Ground Zero. Apparently, Bush declined, which as someone pointed out to me, could've been gracious as well.
Update May 5: Bush has lived up to his presidency. Bush isn't going because he feels snubbed. I wrongly gave him the benefit of the doubt.
That's all the details for now.