I don't quite understand why this is news now. It's been amply published in academic and popular media (including tech-leaning places like http://arstechnica.c

I don't quite understand why this is news now. It's been amply published in academic and popular media (including tech-leaning places like http://arstechnica.com/science/2015/01/a-new-kind-of-antibiotic-that-kills-many-drug-resistant-bacteria/ http://arstechnica.com/science/2015/01/a-new-kind-of-antibio...). Has there been some new development?