WebGL 2.0 Will Hopefully Ship Before Year's End
WebGL 2.0 development was started in 2013 and its specification derived from OpenGL ES 3. There was no ratification of the WebGL 2.0 specification for SIGGRAPH 2015, but it looks like that could still happen this calendar year. Mozilla has been excited about WebGL 2 and in its development Microsoft joined the WebGL working group.
When asked during the WebGL BoF, there's still hope that GLES3-derived WebGL 2.0 will be ready in 2015, but that's not a guarantee.