Stewart Smith of IBM has a new blog post about initial support for POWER v9 in OpenPOWER:
https://github.com/open-power/skiboot/commit/591feeef8353c8a0ee73e42ff1538cf436c5fd1d
http://openpowerfoundation.org/
https://en.wikipedia.org/wiki/IBM_POWER_microprocessors#POWER9
