Besides all the big announcements and mechanics deep dives, BlizzCon also features panels that are creative and fun to watch, but not necessarily important as far as big news goes.
Until I saw this video of the Overwatch voice actresses swapping voice lines, I didn't know that I needed to hear Symmetra say "It's high noon." Polygon recently got the voices of Symmetra, Sombra, Mercy, and Pharah together to say some of the most famous lines from the game, specifically the ones that their own characters would never say.
Recently, Andrea Toyias, Senior Casting and Voice Director at Blizzard and person who holds some of the coolest panels at BlizzCon, tweeted about an article at Rolling Stone covering Overwatch. I think it's one of the most succinct ways to describe the Overwatch phenomenon in terms of its ubiquity.
If you remember a while back we did a post about Overwatch's voice actors being kinda silly.