The only details to add at this point are a photo-op or two, an entrance arch for Krustyland, and that's kind of it.
As for the map, it's no longer in the hands of Groening. It took a pretty long time for him to approve, but the artwork is complete. At this point, this whole World Expo issue is what's holding them back. They had picked a name for the area, but apparently it's already taken, so they have some legal issues to sort out there.. I'm sort of surprised they didn't just bunch it together with Fear Factor and call it a day.