Here are the first two confirmed dates of the 2012 tour for The Dukes of September, i.e. Donald Fagen, Michael McDonald and Boz Scaggs:
August 6 - WolfTrap, Vienna, VI - More info here.
August 22 - The Pavilion, Ravinia, Highland Park, IL - More info here.
And from the land of unofficial info there's been mentioned an August 24 date at The Lawn at White River State Park, Indianapolis, IN. Plus the fact that the whole tour will last from June/July through September.
P.S. For the latest 2012 tour updates click this link!