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Thanks for contacting O'Reilly Media. Have you visited the Head First Labs site recently? Updated details about this book, resources and other Head First titles are located at; http://headfirstlabs.com/books/hfpmp
Also, check out Andrew and Jenny's blog for the latest PMP® news.
I don't see any specific news about a second edition posted yet, but regular updates are listed on oreilly.com for all upcoming titles.
Head First PMP
By Andrew Stellman, Jennifer Greene
O'Reilly Media Inc.-- http://www.oreilly.com