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.