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Soon.....
According to Amazon.com, it's publish/release date is November 15, 2010. It may be available sooner from MS Press.
Book available at amazon
70-515:Windows Application Development with Microsoft .NET Framework 4 http://www.amazon.com/MCTS-Self-Paced-Training-Exam-70-515/dp/0735627401/ref=sr_1_1?ie=UTF8&s=books&qid=1293120462&sr=1-1