We arrive on the 10th and are staying until the 18th. We got the email yesterday. FastPass Plus cards will be mailed via USPS and must bring them with you to the park. You can see all of the information for the program if you log in to https://fastpassplus.disney.go.com/FAQ.aspx. We were able to use any day of our trip except the first day, the 10th. The e-mail we received said only the 11th-15th, but once in the program, it looked like I could pick any day. My days selected were the 14th and 15th though. I'm excited and somewhat skeptical about my choices for "Preferred Viewing Locations" for Wishes and Main Street Electrical Parade.