The trailer opens with a look at the evolution of cell phones, from the earliest of bricks all the way to our current glass slates, before posing a question: "Is 'good' good enough?" It seems Samsung is convinced it has a hit on its hands with its next device, and it's ready to show the world what it's cooked up.
Though the trailer doesn't show much of the phone itself, it does visualize a world of two massive cities laid on top of one another as (presumably) the Z Fold3 opens to reveal its inner display?