this is in my IMHO some features supported by Nvidia extensions on his cards that would be good to have on AMD even if exposing similar features with other new extensions..
(GL_NV_path_rendering) First is some form of accelerated path rendering, I know we have D2D but from own Nvidia benchmarks and already checked by me they seem to have in some cases more than 3-4X speedup by not layering on top of graphic APIs
(WGL_NV_DX_interop and WGL_NV_DX_interop2) Second is OGL-DX interop which would be good now that seems OGL ES 3.0 is around the corner and possibly new WebGL exposing it and while ANGLE won't capable of translating to DX10.x calls soon (i suppose) and Firefox and others use D3D/D2D for layer compositioning seems avoiding GPU communication (i.e. transfers via host) will require this interop..
third and last WGL_EXT_swap_control_tear seems to be for disabling vsync went the renderer isn't able to render at screen refresh rates..
I hope some guys at AMD OGL team think similar to me..