I think the bug report alone is good evidence the next version of Android (be it 4.5 or 5.0) will support WebGL, especially since Android 4.4.3 already shipped with a GPU-accelerated canvas2d. Of course this doesn't mean it is certain.
We talked about it more in our latest blog: https://www.scirra.com/blog/146/webgl-arrives-on-ios-8-and-more