The task of biblical theology… is to present the theology of the Bible – the parts and the whole – in a manner that lets the texts, in all their peculiarity and particularity, set the agenda. In short, biblical theology is the attempt to provide a holistic yet historical account of the biblical testimony to the God of Israel and Jesus Christ. (Kevin J. Vanhoozer, “Exegesis and Hermeneutics,” in New Dictionary of Biblical Theology, Downers Grove: IVP, 2000, p. 53)
By the way, Vanhoozer’s article in New Dictionary of Biblical Theology is a excellent examination of the connection between biblical theology, exegesis, and hermeneutics. He demonstrates clearly that someone’s biblical theology will be directly affected by their methods of exegesis and their hermeneutics.