The Oak Ridge Leadership Computing facility will bring online a new GPU-based system, named Summit, in 2018 with full user operations beginning in 2019. This next generation in supercomputing architecture follows from Titan, our current GPU-accelerated system, but will be much more dense, with multiple GPUs per node and high memory capacity. Increasing density of nodes creates opportunities for data-intensive domains that have not previously considered HPC systems. We'll give details about Summit's design, highlight features of Power9 - Volta NVlink interconnect, and describe ongoing work at our center in preparation for Summit. Lastly, we'll share some lessons leaned, upcoming training events, and opportunities for early access.