Not looking for dirt or anything, but why the fork? What makes this different from Node?

(Only clue so far is the "open governance model"; is that in contrast to Joyent maintaining Node?)

EDIT: Based on their CONTRIBUTING.md page[1], it looks like this is intended to be a more "community-driven" version of Node. A strike against is that SEVERAL (if not most) links in README.md and CONTRIBUTING.md still reference the joyent/node GitHub project.

[1]: https://github.com/iojs/io.js/blob/v0.12/CONTRIBUTING.md