NVIDIA is working on two new GPUs with HBM2-based GP100 on TSMC 16nm process. Both of them use Pascal architecture with 4096-bit memory bus. The first GPU will have 8-Hi (8 DRAM dies stacked) and the second GPU will have 4-Hi (4 DRAM dies stacked) HBM2 memory with 1GHz clocked speed. GP100 should have 4500 to 6000 CUDA cores.
We still don’t know what it will named of GeForce GTX1080 or something new.