Summit Ridge is expected to be more power efficient with TDPs of maximum 95W, far less than the excessive TDP of the current high-end models. The first Zen chips promise up to eight cores and are anticipated to feature DDR4 support, an unknown number of integrated PCI Express 3.0 lanes, and a new FM3 socket. It's unknown of the chip will have integrated graphics.
Additionally, there are also rumors that AMD is planning to switch to Simultaneous Multithreading (SMT) reather than Cluster-based Multithreading (CMP), which would result in 16 threads on the 8 core versions, similar to Intel's HyperThreading.
The bad news however is that Summit Ridge isn't expected to be released until Q3 2016.