0.964 has been released without installer in a portable edition. The main feature of this release is the variable daylength added to the simclimate frontend. Additionally, in the Orbit, Simulation and Analysis frontend it is possible to zoom down to the planet and moon level.
Please note that the Pioneer Anomaly recently got solved without need of new physics. The particular geometry of the antenna dish together with the nuclear power source created the additional acceleration towards the Sun.
More details at this link:
http://www.planetary.org/blogs/bruce-betts/3459.html