NationStates 2 is still covered in mystery. There are a lot of suggestions posted about warfare, trade and diplomacy but no concrete progress has been shown to the players. NationStates 2 will be most likely pay-to-play in the range of $5 to $10 per month. The exact release date has not yet been determined.
Extensive speculation and suggestions of varying degrees of merit can be found in the NationStates 2 Forum.