A mere twenty-two months after 'completion', I got to hold a copy of the book, The HP Phenomenon. And, of course, I 'googled' it to find out that the release date for sale is now October 19 (THIS YEAR). What surprised me was to find out that the HP Phenomenon has become an incredibly popular topic of late... thanks to J.K.Rowling.
How were we to know that when the author of all of those popular Harry Potter books wrote her last book (supposedly) that the series would become titled "HP Phenomenon"? Ah well, fame in a curious way.
Go check the reviews at the Stanford University Press site -- I especially like the one by Don Hammond, one of HP's most important historic contributors.