The Have a good article about Stiche's New Super Sonic Celebration at the WDWMagic.com.
Here's the article
22 November 2008: Stitch's SuperSonic Celebration coming in April 2009
According to a Disney audition notice, the new Stitch show set to open in April 2009 in Tomorrowland is to be called 'Stitch's SuperSonic Celebration'.
"Disney Auditions is seeking male vocalists and comedic actors for a brand new show in the Magic Kingdom® Park at the Walt Disney World® Resort near Orlando, FL opening in April, 2009! Stitch's SuperSonic Celebration will incorporate cutting edge technology, comedic improvisation, and dynamic choreography all set to energetic, stylized music that will make this party out of this world!"