This driver supports all of OpenGL 3.2 and GLSL 1.50, except for the following:
Geometry shaders as part of the core. You can use the ARB_geometry_shader extension instead
glXCreateContextAttribsARB() does not yet support the GLX_CONTEXT_PROFILE_MASK_ARB attribute value. In order to create a Core profile context, call glXCreateContextAttribsARB(), request OpenGL 3.2 as the version, and leave the GLX_CONTEXT_PROFILE_MASK_ARB attribute out. In order to create an OpenGL 3.2 Compatibility profile context, call the "old" glXCreateContext() entrypoint. Note: wglCreateContextAttribsARB() does support WGL_CONTEXT_PROFILE_MASK_ARB.
We have a discussion thread open on these drivers right here.