writes "Seems a bit too good to be true: Apple listening to its community and implementing the features most requested? Apparently a build (v62) of Safari has been leaked into the wild, and has tabs -- though not fully implemented yet -- and primitive support for autocomplete in forms. The Think Secret rumor site has the scoop."
It is not merely a rumor, I've confirmed it. It works nicely, too, in a brief test. Then I, uh, deleted the copy I looked at.