It all points to Him, everything that had come before, the promises, the prophecies, the people. Here we reach the climax of God's story in a person, God's son, Jesus Christ. We don't understand him until we see how he fits into what's come before.
God's story is both cosmic in scope and intimate in care, we see that as he chose to fulfil his purposes in a family. But why did God choose Abraham and the people of Israel to be the ones who would be a blessing to the whole world?