Roku announces Roku 4 media streamer with 4K video, 802.11ac Wi-Fi

The media-streamer arms race continues unabated, with Roku taking the wraps off its Roku 4 less than six months after shipping its retooled Roku 3. The Roku 4 joins the ranks of the TiVo Bolt and Amazon’s Fire TV in delivering 4K resolution (with HDMI 2.0) and supporting 802.11ac Wi-Fi, and a new version of