My fear is that they take elements of factions or reputation and enter it into D&D. It would be easy as basically it's already built on levels and quests. To enter a PrC you have to have a certain reputation to a faction, which is done by doing quests for the faction, which in return return faction XP points the DM awards you. Only then can you enter the PrC. No more requirements of +5 BAB, or Saves, etc. But rather Faction, this would truely make it the PrC class that they wanted them to be in the first place.