Here's a bit from the press release:
Wicked Cool PHP [...] is a different breed of PHP book. It's made specifically for the developer who wants to know how to get things done without mucking around and wasting a lot of time. This is not a weighty PHP complete reference or bible that threatens to take down your bookshelf and the rest of the bookcase. This is a book for coders to pick up and use, not wade through.
It provides the reader with "76 immediately useful PHP scripts" that do a variety of things like send/receive email notifications, do some web scraping, track users with cookies and sessions and use web services like SOAP.
You can find out more about the book on this page on the O'Reilly website. The book will officially hit the stands February 15th.