On the last day of XDC2012, plans for the future OpenGL Linux ABI began to be plotted. This was quite an interesting discussion that's certainly worth watching.
The discussion was around providing a new Linux OpenGL ABI to better focus around today's needs and technologies rather than sticking to a decade old ABI. Backwards compatibility, however, will be maintained. That article has more information on the background of the original proposal by NVIDIA for coming up with a new Linux OpenGL ABI.
Embedded below is the video where Intel's Ian Romanick, NVIDIA's Andy Ritger, and others had quite a good discussion about future requirements and what this OpenGL ABI will probably look like. The discussion will continue on the mailing lists.