The scientists were investigating a phenomenon called quantum tunnelling, which allows sub-atomic particles to break apparently unbreakable laws.
That's all you need to know right there.
Quantum tunneling has been known to have been instantaneous for some time now. I suppose they managed to demonstrate the effect in a new and exciting way.
However, using quantum tunneling to convey complex meaningful information at FTL speeds, and thus violate Einsteinian causality is a whole other ballgame.
Einstien called quantum physics "Spooky action, at a distance." and was very upset by it's implications at first. (like the laser slit experiment, etc.) However, what I find even more bone chilling is how all of the quantum/FTL "loopholes" seem to have yet another layer of underlying principles that prevents them from violating General Relativity in any meaninful way on the macro scale.