From the article:
"It is almost 40 years since superstring theory was proposed as the theory of everything, extending the general theory of relativity to the scale of elementary particles. However, its validity and its usefulness remained unclear due to the difficulty of performing actual calculations. The newly obtained solution to the space-time dimensionality puzzle strongly supports the validity of the theory."
The research has yet to be officially published, but this is exciting news. The wonderful question, "why" still isn't resolved, but at least we're closer to "how" and "what".