Or, they don't want to have to change the search database (again), risking yet another mistake, so have disabled it temporarily while waiting for the actual announcement. One can hope.
That's quit possible.Accidently have a portion of a database up.Realize it's not supposed to be there yet.Take it down for a few hours.In which case the U.S store will have new shiny Mac Pros staring at you when you wake up.