It is sad to see ‘developers’ excited or wanting WebGL. It is a non-standard technology that on non-Windows 8 platforms is extremely dangerous for end users due to direct GPU access and driver/hardware flaws. (A WebGL based web site can LITERALLY use known issues with various GPUs that can cause them to physically fail, let alone execute code outside of the browser space/sandbox construct.)
Instead of pushing WebGL, developers should push non-IE browser makers to get their graphical rendering ON PAR with IE9/10 so that W3C standard HTML5/CSS3 can be used for content that developers are resorting back to WebGL to use because of the horrible graphical performance in Chrome, Firefox, Safari, etc.
(Bing IETestDrive, and notice that standard HTML5/CSS3 sample sites that are graphically heavy run anywhere from 10 to even 1000 times faster in IE, making WebGL irrelevant.)
The W3C has rejected WebGL and has proposed GPU/Shader standards that are ‘safe’ which should be encouraged instead.
If Microsoft came out with WebDirectX, the world would be up in arms and angry for a non-standard being pushed at developers. Yet they are all ok with WebGL.
From the IE11 references, it appears that this may be WebGL support for the WinRT, which Windows can approve and manage to offer a limited version of OpenGL for development.
If WebGL does make it into IE11′s browser construct, it will have little effect on Windows 8 because the OS already wraps and manages GPU calls. However, the irony is Android, Linux, iOS, and OS X are NOT protected and will become the new targets for malicious WebGL content that does get unfettered direct GPU access and code execution.