The next time you navigate to the Home screen on your Roku streaming video player, expect to see something new: a video ad that begins playing automatically. Roku execs have long been promising new ad “experiences” for the Roku interface, and as Cord Cutters News reports, one of them has arrived—an autoplay ad that takes over the static “Marquee” ad spot on the Roku Home tab. The video as marks yet another attempt by the big streaming video platforms to mix revenue-generating ads into their UIs without unduly ticking off viewers. This news story is part of TechHive’s in-depth coverage of the b…