I have not actually done this experience, but here is the info that Disney has on the dining program. Hope that helps
Have you ever wanted a behind-the-scenes look at how the Imagineers make the magic? Well, now you can when you "dine" with one of the "sorcerers" from Walt Disney Imagineering! Join a member of the creative team behind our latest theme park and resort projects for an informal, one-on-one lunch chat at the Disney-MGM Studios' legendary Hollywood Brown Derby. You'll get a fascinating glimpse of the creative process as these talented men and women share what it's like to work in the most magical place in the world. In addition, each party will receive a souvenir designed exclusively for this experience that can be personalized by the Imagineer.
Guests may book the experience up to 30 days out through WDW-DINE; there is a 48 hours cancellation policy.
What

ine with a Disney Imagineer; Receive a Commemorative Keepsake
Where:Hollywood Brown Derby at the Disney-MGM Studios
Day/Time:On select days at 11:30am
Price:
Lunch
Ages 12 and up -$60.99plus tax and gratuity
Ages 3-11 -$34.99plus tax and gratuity