Her is another version of the video I found. It looks like they did a test run first. The other thing to take note is that the above I had assumed was on the back of SpaceShip Earth, but could not tell. The below video of this announcement is done in an empty Epcot and it is defiantly the front of SpaceShip Earth. Thanks to the Disney Parks Blog for getting this out there for us.
I was also lucky to find this third video of the event with some great behind the scenes interviews of the Imagineers who put this together.