RUB, fresh off its coronation as the best place for barbecue, apparently cannot be confined by the bounds of our city. We hear from sources inside the restaurant that an immense 9,000-square-foot outpost is in the works at the Rio in Las Vegas, with a planned summer opening. It will look completely different from the cramped New York original, with an open floor plan, 250-plus seats, and three full-size show rotisseries capable of slow-cooking whole pigs over wood fires. And apparently, this is only the start of a RUB plan for global domination: The restaurant’s negotiating to drop outposts into Harrah’s casinos both inside and outside of these United States. James Bond better let out that tuxedo.