I'm not opposed to having corn on a pizza, but I have a feeling it's gonna be that gross yellow school lunch corn as opposed to sweet corn. I'd rather have onion or pepper.
I tend to be a pizza snob (I make my own homemade pizzas on a regular basis - including homemade sauces & crust: BBQ, Jalapeno Popper, Taco, Bacon Cheeseburger, etc). So I am quite picky when it comes to pizza chains.
I do like Casey's pizza from time to time, but I share the concern that has been highlighted above. I hope they make one for their "pizza-by-the-slice" case. I would definitely like to sample it first before spending the 12-13 (or more) bucks on a full pie.