Future spy planes may take the form of a small flying organism....

Its cool stuff but has the potential to be misused as well.

What doesn't?

I feel as if I had heard of this a few years ago already, something along the lines of a spy mechanical bee, or maybe it was a bird, I'm not sure how challenging insect's flight mechanism is for today's science.
Regardless, you don't see many bees in a tightly shut conference room 34 floors above the ground; it's smaller, capable of flight, sure, but its disguise doesn't seem very effective.