As the world keeps turning and the future moves ever so closer every day, technology will keep getting smaller. You see it with cell phones (with the exception of smart phones), mp3 players, computers, etc. plus I'm sure you have seen, thought of, or heard of the concept of Micro remote control devices.
The "robo-bee" as I call it is said to be completed within the next three years. I'm assuming there are some "bugs" to work out of it! (gosh I'm corny haha)
So this is a video of what Israel started with. Its a robotic Dragonfly that really flies. The MAVs will most likely be smaller.