This new information makes it pretty clear that the cause of the Pioneer Anomaly, that is the deviation of the Pioneer spacecraft from the trajectories dictated by gravity alone, is due to thermal sources internal to the spacecraft. A satisfying result, though it produces no new physics.
See link below.
http://www.planetary.org/programs/projects/innovative_technologies/pioneer_anomaly/20110722.html
For young readers interested in exploring the solar system, see my two most recent books:
Seven Wonders of Space Technology
And