Those that have not read the September issue of Christianity Today that addresses Robert Webber's "A Call to an Ancient Future Evangelical Future" or read the related documents at Ancient-Future Worship dot com, should do so.
Though I would hardly consider myself well-versed in all things "ancient-future," Russell Moore summarizes my general suspicions quite well in his article, Listen Closely:
At the end of the day, the “Ancient/Future” Evangelicalism is a natural extension of American Evangelicalism’s besetting sins of faddishness and consumerism. That’s the reason it is fanned (as so many Evangelical winds of doctrine are) by publishing houses. This project comes to us just as Evangelicalism is in the throes of an infatuation with the so-called emerging church, which is also fueled by publishing houses (the sellers of youth ministry curricula) and which is also enamored simultaneously with postmodern cynicism, egalitarianism, doctrinal flexibility, and ancient-seeming worship.
The rest of the articles can be found here: Back & Forth to the Future: A Critical Symposium on A Call to an Ancient Evangelical Future