Planets when retrograde gain strength to act. This implies that while Jupiter is retrograde, we may have to struggle more to gain the fruits indicated by Jupiter. We all expect exalted Jupiter to shower us with abundance, knowledge and spiritual fulfillment. With the retrograde status in effect, we cannot expect this shower without doing some work of our own in these arenas.
Jupiter is currently transiting the nakshatra Ashlesha, which is ruled by Mercury and its deity is Sarpa, the lord of the serpents. This is quite a transformational nakshatra and the last part of it, where Jupiter is currently located is considered to be a "gandanta" region. There are three gandanta points in the zodiac, at the junctures between water and fire signs. Planets traversing these regions are assisting us in getting through difficult situations or "karmic knots."
Jupiter entered gandanta on November 3, in forward motion, and then reverses movement on December 8. In reverse motion, Jupiter exits the gandata on January 12, 2015. We may look back one day at this two month period and realize that an extreme move had been made during this time. We may be required to go through some deep karma during this time, but in the long run, it supports our spiritual progression immensely. An interesting note on the karmic challenge offered by Jupiter in Ashlesha gandanta is that the navamsa (ninth harmonic) position of this placement puts Jupiter into the sign of Pisces, showing spiritual completion and regeneration.