Here's a well written article, from BusinessWeek of all places, that goes into more detail about the study and its implications. Unusual for things written in the popular media, it explains the difference between T1 and T2. Unfortunately the drug tested, which decreased insulin resistance, apparently also has significant side effects so don't hold your breath concerning a miracle cure on the horizon. But this study would seem to signal a paradigm shift.
The final paragraph is:
"People with type 2 diabetes are often blamed for bringing the disease on, but it's a combination of genetic and physiological factors exposed to a certain environment. And, this study points out what may be another important biologic factor,"