On January 29, the U.S. Dept. of Justice filed an amicus brief supporting respondents in AmEx III, arguing that to enforce the class arbitration waiver would be to create a large loophole for important federal laws.  The Solicitor General has also asked to argue at the hearing on February 27.  To my knowledge, DOJ

In answer to the proverbial question “how much litigation waives the right to arbitrate?,” the Third Circuit has responded that ten months does the trick, if the party seeking arbitration has engaged in significant motion practice, regardless of whether any discovery was exchanged. In re Pharmacy Benefit Managers Antitrust Litig., __ F.3d __, 2012