Just had the confirmation through in a press release:
NDYCAR announced today that it will not return to Baltimore in 2014.
“After a successful visit to Baltimore, which included record attendance, we are disappointed that our schedules will not align to host an event in 2014,” said Mark Miles, chief executive officer, Hulman & Co., the parent company of IndyCar.
“This was simply a matter of trying to find the best date that worked for all parties, since Labour Day weekend was not an option in 2014. We are thankful to the city of Baltimore, Race On and Andretti Sports Marketing for their support and enthusiasm for the event over the years.”
Miles added: “We continue to finalise our 2014 schedule and anticipate announcing it prior to the end of our 2013 season.”