Last Saturday the New York Times had this article on the impact of Concepcion. An excerpt:
A year later, we’re starting to see how much the game has changed. On April 25, the consumer advocacy group Public Citizen released a report titled “Justice Denied” that said that since Concepcion, judges had cited the decision at least 76 times as a reason to prevent potential class-action lawsuits from moving ahead. In some of those cases, the judges made clear that they were ruling against the plaintiffs through gritted teeth, explaining that Concepcion basically made it impossible to come to any other decision.