Just look at a graph of driver performance vs. version number. It should be obvious that increasing the version number usually improves performance :D
They might as well drop the ".0" part if they continue at this rate :D
Well, I'll always advocate my own GemVer (although it's not that suitable for libraries).
As long as it is out in time to be included in Fedora 18, this is great news. :D
I think the geometry shader thing is just because it's the major component for 3.2 (3.3 is pretty much done except for 3.2 stuff), so they're still just bumping major versions with each opengl version bump. No version inflation going on, just using the same scheme they always have, but the time between 2.1 and 3 was a lot longer.