Addendum:

> POWER9 supercomputers announced for 2017:
> http://www.anandtech.com/show/8727/nvidia-ibm-supercomputers

IBM's OpenPOWER-based HPC roadmap shows POWER8+ with NVLink in 2016 and POWER9 with PCIe 4.0 and enhanced CAPI and NVLink in 2017.