I had figured that with the whole Eckhart Tolle controversy, they would have backed off this plan. But the logic is pretty compelling:

“Oprah Winfrey has been declared the fourth person of the Trinity, according to an astonishing new theological agreement hammered out by the world’s major Christian denominations. Along with the Father, Son, and Holy Spirit, the popular talk show host will be recognized as one person in the sacred and indivisible unity of the Godhead–or Quadhead, as the updated Trinity will now be called.”

More here.