ANGLE will soon be merging its ES 3.0 development branch to master, to make available (and more visible) the changes we've been making over the past several months in support of ES 3.0, and to remove divergence between the master and development branches.
The previous master branch will still be available as the es2only-legacy branch, and SHAs will not change, so dependencies on individual commits of ANGLE will continue to work as expected. However, new contributions against es2only-legacy will generally not be considered, and future work should be done on master.
This merge doesn't signify completion of ES 3.0, as we have some features still left to implement there, but interested developers can explore the work in progress. A significant portion of 3.0 features have been implemented, including:
ES 3.0 features should not yet be considered stable, even where implemented, and some features are present only via naive implementation so far. There is still quite a bit of work ahead of us before ES 3.0 support is complete, but this merge should provide insight to those interested in what we've been working on!