Launch window starts at 11:30 PM Eastern time, lasts for 4 hours. The boosters have previously flown and will attempt recovery back on land; the core, on a barge at sea. Two dozen satellites are on board, including a solar sail for the Planetary Society along with bits of 152 dead people. No cars this time. Though it would be funny if one of the small satellites turned out to be little more than a box filled with the Tesla Roadster & Starman Hot Wheels toys, used to send a cloud of little vehicles into the path of an enemy satellite like a shotgun blast.
UPDATE: The boosters successfully landed on their pads, but the core missed the barge and went kerblooey into the ocean. however, the mission of putting satellites into their correct orbits seems to be proceeding smoothly. This was reportedly the hardest core landing yet attempted, so it’s not too surprising that it wasn’t successful… but the mission as a whole seems to be.