It won't be surprising if some of the details change, even after launch. Facebook has said it's unsure how it will measure success, and there are a few months to go before things get started. However, there's plenty of incentive for Facebook to add news to Watch. News stories provide a more steady stream of video than entertainment, and you're more likely to comment on and share real-world events than a comedy or drama. And then there's the question of tackling fake news. In theory, having trustworthy news videos could counter bogus and sensationalist material shared in your regular feed.