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When the book is releasing...
Waiting from long time...
No release date has been announced yet.
You can use the 70-503 book as not much has changed between 3.5 and 4.0. The following link will help you as well http://www.jamesjfoster.com/blog/2010/resource-links-for-70-513-wcf-certification-exam/
Jeff Wharton MSysDev (C.Sturt), MDbDsgnMgt (C.Sturt), MCT, MCPD, MCITP, MCDBA Blog: Mr. Wharty's Ramblings MC ID: Microsoft Transcript Please mark answered if I've answered your question and vote for it as helpful to help other user's find a solution quicker