For those not paying attention to the Mesa Git repository, Ian Romanick has landed more OpenGL 3.0 support work into the open-source code-base.
Among various driver work, Ian has pushed the GLX_ARB_create_context and GLX_ARB_create_context_profile work on the Mesa side. Though the X.Org Server side changes
haven't been merged for xorg-server 1.12.
See the Mesa Git log
for the latest development activity on the open-source user-space driver components.