There's an update to the federal class-action lawsuit filed over the new speed camera program in Providence.  Retired Superior Court Judge Mark Pfeiffer has been appointed to serve as mediator after both sides agreed to the arbitration.  A spokesperson for Mayor Jorge Elorza also says that the language in the tickets received by motorists has been updated in the wake of the suit, which alleges that the violation notices do not specifically cite Rhode Island speeding laws.  A judge earlier this week refused a request for a temporary restraining order against the use of the cameras pending the outcome of the suit.