DVC Members may take up to three guests to the preview. The blue membership card and a photo ID are required.
Here is the informatoin from the Member's website:
Preview The Seas with Nemo & Friends
Be among the first to experience The Seas with Nemo & Friends, inspired by Disney/Pixar's Finding Nemo, the latest addition to Epcot® at the Member preview, October 13-15, 2006 (9:00 a.m. to 9:00 p.m.). This new ride-through attraction will lead Epcot Guests down under with characters from the Disney/Pixar blockbuster film Finding Nemo.
Each Member who presents his/her Disney Vacation Club Member ID and a current Photo ID during the event may enjoy this preview with as many as three guests.
Members should check in outside of The Seas with Nemo & Friends pavilion (the pavilion formerly known as The Living Seas) and look for Cast Members in pink and khaki attire to direct them. Admission to Epcot® is required.
Paid Theme Park admission is required for participation in this preview. The Seas with Nemo & Friends may experience some downtime during this preview period, and the attraction is subject to closure without notice.