Google cast, which presently requires an external hardware might be coming to Google fibre. It means that Google fibre cable TV will support thousands of over the top audio and visual services offered by google cast. Users will also be able to stream their local content using their smart phones and tablets. Chromecast code snippet also confirms that Google fibre remote is being referred hence Cast is going to be added shortly. Some beta testers have also approved of this so surely this information is true to the best of knowledge.