The low level (average altitude 130 miles or 210 kilometers) imaging, gamma ray and neutron detector observations, and gravity data gathering will continue until 1 May 2012.
After that, Dawn will spiral upward to a high altitude orbit for additional mapping. in July of 2011, much of the Northern Hemisphere was in shadow. Now, some of that region is in sunshine, and Dawn can gather details from there.
Dawn is now scheduled to depart for Ceres on 26 August, arriving as planned in February of 2015.