With regards to "major version 4" we are doing our best to follow semver, where backwards incompatible changes require a bump in the major version.

So yes and no, this is a work in progress (what isn't) and we will constantly be pushing to make the docs better. We've been working hard over the last couple of weeks to get this into some form of a publicly releasable state, but yes it's not perfect :)

If you want to help us out, feel free to submit PRs or issues on github. The main site is at http://github.com/ampersandjs/ampersandjs.com while the API references are generated from their individual readmes, all available in that github org.