It's quite an old story, and it's not that interesting I believe. All the components have been available for a while (external stimulation of the nervous system, recognizing EEG patterns, etc.). This experiment is mostly designed to make these things interesting to the general public, not because it's scientifically important or because it represents a big step forward towards controlling or understanding the nervous system/the brain.
A person interfaces to another person over the Internet, and gets him to do something with his body involuntarily, and you think it's not "that interesting"?
All I can say is you must be living in a truly advanced world :)
It could have been done twenty years ago, and it will not progress beyond what is shown here: causing a given muscle to twitch.
Transcranial magnetic stimulation is inherently imprecise and brutish. It causes all the neurons in the target brain area (3-4 cm^3) to discharge at once. Depending on the intensity of the stimulation, you can recruit more or less neurons, but it is not selective.
For most of the brain, it just disrupts the activity for less than a second, causing a "virtual lesion". This is useful for brain mapping research, but that's it.
When you zap the motor cortex, it also sends action potentials down the spine, which in turn stimulate the motor neurons then the muscles.
The hardware is bulky and unpractical [0]. You could maybe use two coils per brain hemisphere, and then, you must stimulate areas distant from one another.
For the foreseeable future the only mind control techniques are propaganda and manipulative behavior, with some drugs sprinkled in for good measure. No need to worry about this.
I don't care what that lunatic Alexander Graham Bell says, and I don't care what stupid little one-time demos he has in his lab, the telephone is never going to take off.
The electric resistance of the skull is way too high to send any useful information through electric stimulation, and magnetic stimulation is inherently blunt.
For the same reason, the complexity of the information that you can get with EEG is very limited. There's a lot of noise, and the spatial resolution is very coarse.
Useful brain to brain communication requires invasive surgery, in order to put sensors and stimulation electrodes next to the cortex. It will happen, and it will be revolutionary, but the method described in the article is not a progress in that direction.
These days, I think it is valid to take "over the Internet" out of the equation when deciding if something is impressive. For most applications, the Internet is a black box for transferring bits.
For "over the Internet" to be interesting, it needs to be pushing then boundaries of the Internet in some way.
Many proof of concepts are not very interesting. They are mostly a collection of existing techniques to prove a point, often to the general public: that we are capable of doing this with current technology.
