Last night there was a display of mini-drones in formation over Guangzhou, ostensibly to celebrate the New Year.
But clearly coordinating over 1,000 drones so perfectly is unlikely to be a job for an army of fallible humans.
Imagine a battlefield where instead of dumping 500-pound smart-guided bombs out of circling jet fighters with only a short "playtime" to kill a handful of insurgents, a swarm of computer-controlled heat-seeking/visually guided dronelets seek out and kill individuals precisely and cheaply, with a few ounces of explosive each.
The potential has been discussed online within the last two years, e.g. here:
Was China saying, we're there now and woe betide etc.?