The Playbook," though we have no way of confirming that at this time. It certainly make sense though given T-Mobile USA's recent move away from overage charges in favor of throttling.
Update: We're hearing from a couple sources that the shot here from The Playbook is a little out of context, and actually refers to a new feature for businesses looking to restrict disproportionately high usage by employees with company data cards. That sounds a little less painful, does it not? Thanks, everyone!