I know it’s best to keep an open mind as to what this mysterious major global IP (e.g. Ghostbusters), but at this point after what's been happening on Twitter, I would be very surprised if it wasn’t Jurassic World.
I believe that this date, 10th June 2021, is going to be a very big day for the Jurassic World franchise. It will be exactly one year until Jurassic World Dominion is released and is the day that the new Jurassic World ride, VelociCoaster, will officially open. It sounds like the perfect day to build hype and make headlines for JWD by also releasing the movie's trailer, announcing a new video game that would be released alongside the movie and make a new viral marketing website go live.