Hi Constance,
As a person who likes to get the most bang for my buck, I would totally want free dining if they offered it.
In the past, Disney has offered the free dining in the late summer such as August and September. I do not know if and when they will be offering free dining this year.
I would suggest you go ahead and book the vacation you want now. This way you can pick your dates and resorts which you want.
Then if Disney does offer the free dining during your stay and you qualify for it, call Disney and ask them to modify your reservation. I know of friends who had this happen and Disney honored the request.
To receive the latest updates from Disney, go to
http://disneyworld.disney.go.com/wdw/index which is Walt Disney World's home page and on the far right hand side is a link to sign up for emails on special events and information at the Walt Disney World Resorts.
Have a magical adventure with your children!
Beth