http://en.wikipedia.org/wiki/Software_versioning#Sequence-ba...
> In this system, the third digit (instead of the second digit) denotes a minor release, and a fourth digit (instead of the third digit) denotes bug-fix/revision releases. Because the first digit is always 10, and because the subsequent digits are not decimals, but incremental values, it is likely that a hypothetical 11th major version of OSX, should it exist, would be labeled "10.10" rather than "11.0".
They did 10.4.10 and 10.4.11 so I'd say its within the realm of possibility.
[I'm aware that Ubuntu release code-names are probably not trademarked since they don't refer to the official release of the OS. Still, reusing another codename that's popular public knowledge in the tech community? That would not be cool.]