I'm sorry for the delay. The book is taking longer to complete than expected. It should be moving to the production part of the process soon, so it should be available in the end of this year or the beginning of the new year.
In the meantime, you might be interested in one of the other new books on Perl 5.14, Learning Perl, Sixth Edition or Perl Pocket Reference, Fifth Edition.
Once again, I'm sorry that the book is not complete yet, but I hope you'll be pleased with the final product.