After the summer, I would like to lead another small book group. I'm leaning toward N.T. Wright, Surprised by Hope: Rethinking Heaven, the Resurrection, and the Mission of the Church. 
Wright is one of the leading New Testament scholars of our time, a prolific author, and the former Bishop of Durham in the Church of England (he retired in 2010). I don't agree with some of his positions, but I always learn from him, and I love his passion for the church.
I think we could read and discuss his book without hurrying in 6-8 weeks. If you'd like to be part of this small book group (6-8 people), let me know, so we can start looking at our fall schedules.