In his article, What Makes a Church Missional?, J. Todd Billings does a decent (although, by necessity, not very in depth) analysis of the concept of the “Missional Church.”
It is fairly balanced, I think. The biggest thing is not that the concept of Missional Church (as currently described is a few decades old) is new, but that it is not.
Thus, we should not be surprised that God’s new work in mission is also an old work. For we are not shaped primarily by the spirit of the 1950s, the 1990s, or 2008, but by the eternal Spirit, who has been shaping and sending witnesses to the gospel for thousands of years.