I think the temple is the place where everything that happens on the island is controlled from. It could be some sort of city, hidden away, thats why not many people know about it. However I think that there will be new characters in this city, that like desmond was in the hatch, have been locked in ( ie once in you cant get out) that is why they shoot anyone that comes near. They had no idea that she is ben's daughter until she say's she is. Once in she will be able to tell them whats happened or something like that AAAAARRRRRHHHHH my head hurts, going to be a long wait.....