I just got a DVC Members email and they are running previews in Jan for members:
Preview Expedition Everest™
Members are invited to take a sneak "peak" at Expedition Everest — Legend of the Forbidden Mountain™ Jan. 26-29, 2006, at Disney's Animal Kingdom® Theme Park.
The new thrill attraction, opening officially in April, sends Guests on a high-speed train adventure into the Himalayas for a face-to-muzzle encounter with the legendary Yeti.
Each Member who presents his/her Disney Vacation Club Member ID during the sneak "peak" event may enjoy this preview with as many as three Guests. As an added bonus, you and your Guests will each receive a complimentary Expedition Everest lanyard and pin (limit one set per person during the four-day event). Disney's FASTPASS® service will be also be available during the preview.
Get ready for the Yeti!