NHK is working on Hybridcast (an entirely different system to the Hybridcast 3D-delivery setup it demonstrated last year), a system that uses the internet to make vanilla TV broadcasts interactive. It works by pushing HTML5 overlays to your tablet and TV, so you can play along with quiz shows or follow a travelogue from the comfort of your couch. The company is planning to build a set-top-box with the technology ready for sale next year, with integrated TVs hoped to arrive from Sony, Toshiba, Panasonic, Sharp and Mitsubishi shortly afterward. You can see what the residents of Japan can expect by watching the video after the break.