Is Blizzcon streamed in China? I agree - nothing will happen. They'll likely heavily filter what they broadcast in China if they do stream there, and that's about all they can possibly do.
Blizzcon contains live finals for the Overwatch World Cup, StarCraft 2 WCS finals, etc, and they will likely be streamed from the venue and watched by somewhere around (?) 100k people in China, I'm not sure of an exact estimate.