At the end of the video, it was revealed that they were actually telling all of this to Michelle Pfeiffer, who was revealed to be playing Janet Van Dyne in Ant-Man and the Wasp.
Not only did they show off some initial footage (which sadly hasn’t made it online yet), but they made some major casting announcements, including Michelle Pfeiffer as the original Wasp, Janet Van Dyne.
It has long been suspected that Janet Van Dyne is going to be in Ant-Man 2, but no actress had been confirmed.
Also, since Janet Van Dyne and Hank Pym (Michael Douglas) have significant history in the Marvel universe as the original Ant-Man and the Wasp, this is not only welcome news, but important news at that.