The Dawn spacecraft quietly slipped into orbit around Ceres on Friday, March 6 2015. Since the spacecraft is now on the unlit side of the dwarf planet, there are no new images. The most recent images are these crescent views taken on March 1 from 49,000 km above the surface.
By mid April, Dawn will be back in a position to view Ceres' illuminated side, and it will deliver sharper images as it spirals to lower orbits. The Dawn mission at Ceres will continue for the next year and a half.
Below is a simulation of the spacecraft's trajectory at Ceres.