I am mystified why Disney don't state this on their dining plan info. This query has come up on the Dibb every year since I joined! A little note to the effect that other WDW restaurants will be added in due course would do a lot to reassure people.
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I think they'd have to say "may be added" rather than will be as until it's all finalised it would be premature. I agree though that to say something would be helpful to first timers. If I had a £1 for every time someone asked on here about it I could afford a flight to Florida!