One might just want to assume that node.js never wants to build a stable API. They are constantly breaking backwards compatibility and committing to "stable" at this point seems unrealistic. If they'd ever release a stable version they'd suddenly have to backport fixes and care about keeping an API intact for something other than a few months. Like they will not be able to do that thing anymore where they dismiss all those who built upon 0.6 and don't get security updates unless they rewrite big portions of their code base and find new libraries to replace all those they use that have gone dark.

Have they at least committed to some kind of date range for a stable API?

It's kind of silly to worry about because all the various node.js libraries that so many people depend upon are either weekend fads that get abandoned, or moving at the same speeds and likewise breaking compatibility.