It should be noted that the binding will be based on OpenGL ES 2.0, which is the graphics library behind the iPhone 3Gs. It's also worth observing that this is the cut-down specification (ES) for mobile devices, which misses out on library toolkits like GLUT, but has a much more streamlined/simplified API than the wider OpenGL specification.
Knowing the working group, it will take a while to refine, but once it goes live, I expect that both FireFox and Safari will end up supporting the standard and that Google will sponsor an ActiveX plugin that provides the necessary for IE, on the grounds that Microsoft is likely to fight against it in their war against standards.
Lastly, this is likely to be a blow for Flash, since one of the main purposes of Flash is to provide crappy graphics on websites. Flash won't die any time soon – the development tools for Flash-based apps are probably going to carry it forward for some time to come – but WebGL might allow those applications to step up a notch for rendering games.
* Yes, there's a couple of bindings for Python and a couple for SWT/Java which is experimental through Groovy/Scala's interpreter ... but you have to go out of your way to install them over and above the web browser that you currently have installed and are reading this with