In it he responds to his critics (Piper):

Along the way Wright responds to critics, such as John Piper, who have challenged what has come to be called the New Perspective. For Wright, what Paul means by justification is nothing less than God’s unswerving commitment to the covenant promise he made to bless the whole world through Abraham and his family.
This irenic response is an important contribution for those on both sides of the debate–and those still in between – to consider. Whether you’re a fan of Wright’s work or have read his critics and would like to know the other side of the story, here is a chance to interact with Wright’s views on the issues at stake and form your own conclusions.

You can get it for $15 here.All I can say is: get ready this is going to be a bumpy ride 🙂 I guess I’ll be adding yet another book to my summer reading list.
Here’s a link to a 2000 review of Wright’s What Saint Paul Really Said: Was Paul of Tarsus the Real Founder of Christianity? and Dunn’s The Theology of Paul the Apostle by Richard Gaffin.