Don't know about the "final" release (?), but the first
public release of OS X is supposed to happen around
March, 2001.
Given Apple's notorious history for late OS releases,
and the fact that this is an all-new bet-the-farm-on-
the-release OS, I'll bet late summer 2001 at the
earliest, Christmas time being conservative.
So let's say 1 year from now.