As far as I'm aware, the Chrome and Firefox parts of the respective OSes run in userland, and not that close to the kernel, whereas the diagram on GitHub for this suggests the kernel and Node would be much closer. I could be wrong about this though, it's vague.
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Sounds interesting, and could serve as an alternative to Chrome OS or Firefox OS.
In many ways, it's a throwback to the old days of Lisp machines. Entire OS in a dynamic language, extensible at run-time, etc...
With the many languages that compile to JS (and now Asm.js) this could be huge and very interesting.
As far as I'm aware, the Chrome and Firefox parts of the respective OSes run in userland, and not that close to the kernel, whereas the diagram on GitHub for this suggests the kernel and Node would be much closer. I could be wrong about this though, it's vague.