Apparently Nintendo wants to Pokemon-up (or should that be Mega Man Star Force-up?) the Fire Emblem series, as the next game, Fates, will require 3 (Yes, three!) purchases to get the whole game. To get the "lightness" campaign, you will need to buy the retail/digital version called Birthright. To get the "darkness" campaign, you will need to buy the retail/digital version called Conquest. And to get the third campaign (which either takes place after the other two stories or as an alternative version of events, I'm not sure which), you need to pay to get the digital-only DLC campaign.
Now I'm all for making this a big game, but is it really fair to split it into three pieces? Sure some people will never finish any of them after starting one, but most people who finish one will want to see what happens in the others. I really wish they would have either made it into a series of three, releasing one per year, or that they would have combined all three into one $60 game if they really wanted all the content in a single release.