Much like what has happened with Google+, Google is taking some of the best features of its Hangouts on Air live-streaming service and moving them to YouTube Live. Starting September 12th, if you want to livestream through a Google service, using YouTube Live is the way to go. Google released a walkthrough on how users can make a transition to YouTube Live, including things like starting, scheduling, and controlling livestreams from there.
The native Q&A feature won’t be included in the transition. This time, Google wants broadcasters to use social media or Google Slides’ Q&A feature to communicate to viewers while streaming. Showcase and Applause are also getting cut.
Source: The Verge