Very confusing

Well, now that Web 2.0 is not new any more, some people start writing about Web 3.0 or higher as if this were a kind of software update which is due after at least one year. If you ask me, it rather seems to me as if this is getting totally out of scope here. What exactly is in there beyond mere visions? Not that visions are any bad, but I'd rather like to see some more down-to-earth stuff.