OS X Snoop Lion.
Probably too early to speculate there. ZFS was on Apple's site for a while, so hopefully they have learned to be sure before publicly committing to huge underpinning changes.
Samsung has cornered the market there, unless Apple goes with more esoteric terms like OS X Andromeda or OS X Perseid.
Unlikely, considering hardware roadmaps point to seperate architecture for smartphones and computers for at least the next five years. But their convergence platform would either be AppleOS or just iOS.