This is pretty cool:

But this time, the company will attempt to land the first stage of the rocket intact on a barge floating in the Atlantic Ocean. After the booster falls away and the second stage continues pushing the payload to orbit, its engines will reignite to turn it around and guide it to a spot about 200 miles east of Jacksonville, Fla.

“We’ve been able to soft-land the rocket booster in the ocean twice so far,” Mr. Musk said. “Unfortunately, it sort of sat there for several seconds, then tipped over and exploded. It’s quite difficult to reuse at that point.”

Mr. Musk put the chances of success at 50 percent or less. But, he added, over the dozen or so flights scheduled for this year, “I think it’s quite likely, 80 to 90 percent likely, that one of those flights will be able to land and refly.”