I don't know the history of how long the major revisions are apart from one another in MacOS' history. The impression I get is that OS X has been around significantly longer than OS 9 or OS 8 lasted although I could very well be wrong. I'm guessing that a new major revision is a while off especially since OS X has become a brand in its own right, i.e. "OS X" is comparable to "Windows" rather than "OS X" being comparable to "Windows 2000". "OS X" seems to have taken the place of "MacOS" even though it is supposedly the tenth major revision of that OS. Any ideas of a potential name, timeframe, functions of the next major revision of the MacOS might have?