The relaunched ride – which features C-3PO in the driver’s seat – will reopen at Florida’s Walt Disney World on May 20, 2011. Learn more about the “reimagined” attraction at the official Disney Parks blog.
I’m hearing that the Disneyland (California) version will reopen May 17, but that’s yet to be officially confirmed.
UPDATE 2/27: The DisneyParks blog says that the Disneyland Star Tours will reopen on June 3.