The only kosher food, to my knowledge, is the prepackaged meals. And I have not heard of any kosher pizza-serving locations anywhere in the Orlando area.
The nearest kosher restaurant to WDW is the "Lower East Side" in Lake Buena Vista, which also advertises itself as Halel and Hindu. I have not eaten there myself so I can't say anything about it.
And, by the way, Florida laws are so strict that I once saw a place in a mall advertising "Hebrew National Kosher Style Hot Dogs". I said to someone there that last I heard HN was kosher, not kosher-style. The reponse was that they cooked the hot dogs on the same grill as non-kosher meats so that made them tref.