Very cool. It's interesting that they are planning to start with Vulkan support, followed by OpenGL/DX/etc.
I guess it makes sense; the RISC-V crowd might possibly skew towards early adoption over backwards-compatibility.
It would be really cool to see some implementations from places like SiFive/GigaDevice/etc. Imagine how easy driver support could be if everyone used and contributed to the same open IPs...
If they wanted to provide OpenGL ES support (all mobile devices) they could just use ANGLE which will provide OpenGL ES support on top of vulkan