DC is obviously being way quicker than Marvel with their plans. I can't help but feel like Marvel really is waiting for DC to make the move first and then decide if it's a good idea to follow suit depending on the reaction/results.
A lot of announcements are probably going to be held back due to all the delays, but if they do announce things, I imagine it's probably going to be all straight to social media. Maybe a couple of live streams if they wanna keep the ''event'' feeling of getting people together.