So SW.com just released a portion of Filoni's interview back in December, which contains some spoilers for the Yoda arc. He explains how this arc reveals how Yoda came to become the wise Master of TESB following the events of this arc. Just about everything he says seems to coincide with most of what we've speculated in the Yoda Arc Discussion thread. Here is a pertinent excerpt: He hints that Yoda wanted Luke to understand all of this and then come to the conclusion on his own that in order to defeat the Emperor, Luke has to come to the realization on his own that his father can be saved. That's an interesting view of what Yoda and Obi-Wan say in RotJ, that while they figure that Vader will likely have to be destroyed, they, Yoda especially, seem to understand that there is still yet a small flame of hope, perhaps even a part of Anakin Skywalker that still yet lives, and that it is up to Luke to bring that out of Vader. Recall the final test in Sacrifice where Yoda battles Darth Sidious in a vision. The whole setup is a reflection of the final Death Star II scene when the Emperor is torturing Luke with lightning. In this case, Anakin Skywalker takes the place of Luke while Yoda takes the place of Vader. The analogy is twisted around such that it's suitably different, but here Yoda and Vader/Anakin must make a choice that would determine whether they are worthy of becoming a Force ghost by gaining the necessary insight that it is ultimately not through war and violence that one can defeat the great evil of the Sith, but through love and selflessness. Yoda chooses to save Anakin and sacrifice himself to defeat Sidious in his vision, in much the same way that Vader chooses to sacrifice himself to save his son and destroy the Emperor. The final insight that Yoda gains, then, is illustrated perfectly at the end of the RotS novel: "The dark is generous, and it is patient, and it always wins—but in the heart of its strength lies weakness: one lone candle is enough to hold it back. Love is more than a candle. Love can ignite the stars." It is this insight that Luke gains in his final confrontation with Vader that ultimately allows the prophecy of the Chosen One to finally be fulfilled.