One of the most closely watched features of the new health insurance marketplaces has been the cost of health plans sold in them. In a new blog post, The Commonwealth Fund's Jordan Kiszla reports on a June 27 briefing held in Washington, D.C., during which congressional and administration staff, journalists, and other policy stakeholders stakeholders discussed the likely key drivers of premiums in 2015 and compared cost trends for marketplace plan premiums with those in the individual insurance market prior to the passage of the Affordable Care Act.