I know I'm a little late on this one but John Piper released a new book in November called The Future of Justification: A Response to N. T. Wright. Here is the description from Amazon.com:
"Pastor John Piper thoroughly analyzes the teachings of Bishop N. T. Wright on the topic of justification and sounds a call to discernment for the entire church.
N.T. Wright, a world-renowned New Testament scholar and bishop of Durham in the Church of England, has spent years studying the apostle Paul's writings and has offered a "fresh perspective" on Paul's theology. Among his conclusions are that the discussions of justification in much of the history of the church certainly since Augustine got off on the wrong foot, at least in terms of understanding Paul and they have stayed there ever since.
Wright s confidence that the church has gotten it wrong for 1,500 years, given his enormous influence, has set off warning bells for Christian leaders such as John Piper, a pastor and New Testament scholar. If Wright s framework for interpreting the New Testament text and his understanding of justification find a home in the church, not only could the doctrine of justification be distorted for generations to come, but the New Testament writers original intent could be silenced. So Piper is sounding a crucial warning in this book, reminding all Christians to exercise great caution regarding fresh interpretations of the Bible and to hold fast to the biblical view of justification."
Piper is responding to Wright's book: Paul: In Fresh Perspective. Now, I defiantly expected Wright to get some flack for this one and I should have expected Piper to get in on the discussion. I often agree with Wright, in fact he's probably my favorite living author, but I also have a certain respect for John Piper. If anyone is interested in either of these authors you might want to read both of these books.
P.S. My good friend Danny sent me this: Wright on His Critics. It is a short response from Wright on his critics. He talks about Piper near the end. This article comes from Trevin Wax's blog Kingdom People. You might check it out, he's written a lot on Piper's book in the past month.