A feature called Crowd Play will allow fans of a YouTube streamer to jump right into a game and play with the creator they were just watching. Interaction with viewers is such an integral part of livestreaming, so creators could take to this feature very quickly depending on the genre of games they play. Successful creators usually follow stringent streaming schedules to keep their fans happy, so its not hard to imagine a future where it becomes the norm to have Crowd Play time distinctly carved out.
Stadia integration with Google Assistant will also have far-reaching effects on YouTube. According to Google, Stadia users will be able to ask Google Assistant for help during a particularly difficult point during a video game. Google Assistant will automatically detect where the player is in the game and serve up the most relevant YouTube video to help out.
[Source: mashable.com ]