It would be nice if Apple finally finished up OpenGL 3.0 development with the addition of GLSL 1.3. But I can't see any pressing need to deliver OpenGL 4.0 (which is equivalent to Direct3D 11) anytime soon. Graphics APIs have progressed at a ridiculously fast pace lately--far faster than the applications which could employ them. It took 4 years to go from OpenGL 2.x to OpenGL 3.0. Then suddenly in the last two years, we've seen a new API release every few months: 3.1, 3.2, 3.3 and 4.0.
However, exactly zero applications currently require OpenGL 3.0 (OS notwithstanding). A similar API blitz has occurred on the D3D front. DirectX 10 was a major evolutionary step, but before developers got a chance to adapt to it, 10.1 and 11 were released. Zero applications currently support/require D3D 11 and it will be a hell of a long time before any do...and by then, D3D 12.x will probably have been released.