[steve86]

IOW, they are not acting on their own. Rather, a single “brain” in the main computer is controlling all of them

What you say may be true regarding this demonstration but off-the-shelf R/C gear can be programmed to do all of this except maybe for the close formation flying (and that isn't far away -- just a matter of further miniaturization of electronics and sensors). What will be more impressive (and creepy) will be autonomous decision-making and goal-seeking. Rumors military RPVs can do this now.

[cuban leaf]

—and that isn’t far away — just a matter of further miniaturization of electronics and sensors—

That right there is the exciting - and scary - part