Oh, I got that info from the Mousesavers site for AP with dining:
Available only with vacation packages that include accommodations at a Disney-owned-and-operated hotel plus at least a 1-day theme park ticket per person, Disneys Magic Your Way Package with the Dining Plan is a convenient and affordable way to experience many of the unique Disney dining locations found across the Walt Disney World Resort.
The additional cost (on top of a regular Magic Your Way package) varies depending on the time of year:
1/1/12 - 2/15/12, 2/26/12 - 3/8/12, 4/15/12 - 5/31/12, 8/5/12 -12/20/12 is $51.54 per night per adult or junior (ages 10-17), $15.02 per night for children (ages 3-9).
2/16/12 - 2/25/12, 3/9/12 - 4/14/12, 6/1/12 - 8/4/12, 12/21/12 - 12/31/12 is $53.54 per night per adult or junior (ages 10-17), $16.02 per night for children (ages 3-9).