We rode it today for the Passholder preview! It was great! And only a 15 minute wait, you gotta love that.
The CM's were reiterating over and over and over though, that the general public opening was going to be May 5th. Maybe you'll get a CM with a soft spot in a good mood and they'll let you on. Today, it was strictly passholders and DVC members, and they really sticking to it.
Very cool ride.