At last, the Kindle version is out. It replicates the hardcover version except that we have added some photos. It is priced at $9.50. Go for it!
However, there is an enhanced eBook version that will be out soon and both versions will be out in a variety of formats (i.e., Nook, iBook, etc.).
The enhanced version will have the additional photos plus embedded videos of the Delta 191 simulation, downbursts, etc., that complement the text.