I'm hoping they aren't using the instance servers to make these instances. The instance servers seem the most unreliable ones we have and they easily become overwhelmed (blocking access to any instanced content, from single player quest fights to full raids and now potentially several whole new regions that thousands of people are going to be in) after major numbered patches, let alone a whole expansion pack... I'm lucky in that Ragnarok isn't on the list (at least not yet) but I wouldn't wish those overloaded instances on anyone...