Here is an email I got from BGE when I asked if the sneak peek weekend was for passmembers only:
Dear Mr. Petzold:
Thank you for your interest in Busch Gardens Europe. Griffon debuts on May
18th.
Thanks again for visiting our website. Should you require additional
information, please contact our Customer Information and Service Center at
1-800-343-7946.
Sincerely,
Genevieve
Guest Correspondence Team
Busch Gardens Europe
The media unveiling is the 16th and Busch is doing a webcast of the event. www.buschgardens.com