Technically, the pre-order price guarantee does not apply at all to Kindle books (there is list of what does on the Amazon site). Many people have reported paying the pre-order date price, regardless of what the book does beforehand and what the book sells for on the release date.
On the other hand, Under the Dome had a low of $7.20 and everyone who bought it, including those who ordered after it went up above that number AND those who bought it under the second ASIN (the first ASIN went down to $7.20 at one point, the second never did) all got it for $7.20 if they pre-ordered (I was one of those with the second ASIN). I haven't heard of any other books where this occurred.
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