From the press release . . .
This announcement comes at the end of a two-year development and consultation process, but in many ways, it began much earlier. Since 2007, CC has been working with legal experts around the world to adapt the 3.0 licenses to local laws in over 35 jurisdictions. In the process, CC and its affiliates learned a lot about how the licenses function internationally. As a result, the 4.0 licenses are designed to function in every jurisdiction around the world, with no need for localized adaptations.
View entire press release at Creative Commons.