Rick Phillips has a very helpful article, over at Reformation 21, in which he gives careful attention to the major passages that are often appealed to in order to support the “so-called” doctrine of “future justification according to works.” This is an extremely important discussion, as it deals with matters of Christians truth and assurance. Even if you are not familiar with the debate surrounding the New Perspective(s) on Paul, I think this will be a very beneficial article for you. You can read the whole thing here.
R. Scott Clark also has a nice resource page that you will find extremely helpful in learning more about the deviant theology of proponents of the New Perspective(s) on Paul, in regard to justification. You can find it here.
Christ the Center has a two part interview with Guy Prentiss Waters that gives a sweeping overview of N.T. Wright’s newest book Justification: God’s Plan and Paul’s Vision. You can listen to part 1 here, and part 2 here.