Coming in early 2017, PowerDVD software will support UHD Blu-ray on PC - assuming hardware compatibility.
http://www.guru3d.com/news-story/powerdvd-and-hitachi-lg-will-offer-first-ultra-hd-blu-ray-playback-for-pc.html
http://www.guru3d.com/news-story/powerdvd-and-hitachi-lg-will-offer-first-ultra-hd-blu-ray-playback-for-pc.html