Hi kuterp,
Pin placements do take a while to implement because of the photo-realistic nature of the game. Each photo we have (both on and very close to the green) points to the specific location for where the pin is now. In order to switch pins we have to switch around a few hundred different pictures on every single hole so they are centered towards the new location. Unfortunately, that does take a little time to complete for each new set of pins.
Right now Bethpage already has alternate hole placements. St. Andrews will have a new set of hole locations just in time for The Virtual Open and right behind that will be a new set for Kiawah as well.