Good question! I was wondering this also. Hopefully someone will chime in with an answer. This is what I found on their website:
Ticket Package includes:
* Ages: 3 and up (Adult)
* 4 days of admission to both
Disneyland® Park and Disneys California Adventure® Park, including visits to both Parks on the same day
* $50 Disney Gift Card
* Available for Southern California Residents residing in Zip codes 90000-93599. Proof of residency required upon admission
* Use all 4 visits by August 31, 2011
* Ticket is blocked out on 7/1/11 - 7/4/11 and 8/21/11-8/22/11
* Must be used by the same person on any and all days
* Offer cannot be combined with any other ticket discounts or promotions
* Limit of 8 tickets may be purchased per Costco member, per day restrictions apply
Disney Gift Card Benefits:
* The Disney Gift Card can be used at many locations throughout the Disneyland® Resort. Use it to pay for Disneyland® Resort Hotel accommodations, food, merchandise and so much more. In addition, the Disney Gift Card can be redeemed at the Walt Disney World® Resort,
Disney Cruise Line® Services, Disney Stores, DisneyShopping.com, Adventures by Disney and Walt Disney Travel company packages.
Hope this helps!
Jenn