While the technical expertise necessary to perform such a capture is probably (one hopes) beyond the skillset of most cybercrooks (always allowing for the geek factor) the findings are significant as a reminder of just how open even our most closed systems may well be.
Nothing particularly dire or of immediate concern here (words I sincerely hope I don't regret any time time soon, or ever) -- and not even particularly new: this sort of eavesdropping has been a topic of concern at government and other security agencies for some time.
Just one more little worry to add to the collection of obscure, specialized and hyper-technical vulnerabilities that seems to grow larger every few weeks.
A video and description of the experiment can be found here.