Blizzard has apparently been getting slammed by fans wondering if BlizzCon 2020 will still even happen this year. As there have already been countless other events that have been postponed or outright cancelled due to Covid-19, this isn't exactly a weird thing to be wondering even if the event is commonly held in November. It's been a wild year so far with absolutely anything and everything being a possibility at this point.
Even with the event presumably being many months away from its typical November window, Blizzard fielded the question as best as they could:
While we’re all hopeful things will look better later in the year, the bottom line is that at this point it’s too early to know whether BlizzCon 2020 will be feasible. The health of our community, employees, and everyone who helps with the show is our top consideration. It might be a few months before we know for certain if or how we’ll proceed, but as soon as we have a meaningful update, we’ll share it.
Once they know for sure what the future holds for BlizzCon 2020, they will be sure to share it with the community.