The test is another step in SpaceX's drive to produce a recoverable and reusable first stage, which saw another leap forward with the successful splashdown of the actual Falcon 9 first stage after it launched the Dragon cargo ship toward the International Space Station .

I can't get much more specific because SpaceX hasn't talked about the test yet (that usually happens after a day or two). As near as I could tell (which turned out to be very poorly indeed — see this update) it flew to the same 800-foot height that it did two weeks ago, and took the same type of course: up, hover, move sideways, land.