I don't know about KDP in particular but I have found that Pre-Order books do have one advantage over books that are just out for sale. You save a percentage of the normal price that the book is to be sold at by exercising the pre-order option. And saving some $ while getting a good book is always good. I'm waiting on one such now. The Ghost and Mrs. Muir is due out at Amazon as a kindle book in Sept.
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