Yes you can still add it on, and I was told its $68 dollars a day per person for the add on price.
And it is for the length of your stay, unlike the FTP where you pay for 4 and get three free. The silver add on would be a charge for all seven days.
I used the Silver (Discovery Magic as it was called last year) and it is wonderful. We used our wishes for Cirque, WONDERFUL surf & turf dinners 2 nites in a row (canada & brown derby) watermice rentals, lots you can use them for
Hope that helped, didn't mean to ramble.
