Isn't it lovely? The useful Bach Cantatas website has extensive information on it here. In considerably simplified form, it survives in many Protestant hymnals, making it a candidate for the creative talents of the Berliner Solistenchor.
In a video trailer for the "Old/New Christmas carols" concert (viewable here, auf Deutsch,) the director of the chorus, Christian Steyer, has said that what fascinates him about the chosen carols is the tension of contrasts. "Light is connected with darkness, joy is connected with pain, warmth is connected with cold. And in the texts which move me especially, these [opposites] are always colliding with each other." Rather cheekily, he also describes the new arrangements as "bringing a new shoot out of an old root." And there shall come forth a rod out of the stem of Jesse, and a branch shall grow out of his roots, and ye shall have sweet jazz stylings on "Joseph lieber, Joseph mein." If you're in northeastern Germany, be advised that the group is taking this concert on tour this month; details on their website.