Information here... http://serenesforest.net/2015/04/01/fire-emblem-official-site-snippets/#more-25442
Here are important quotes...
★Fire Emblem if Hoshido
A story focusing on protecting your Hoshidan birthplace and royal relatives from the Nohrian invasion. Outside the main story, you can earn experience and funds and freely develop your characters; perfect for those who enjoy freedom.
★Fire Emblem if Nohr
In this story, you work with the Nohrian royal family to battle the internal conflicts within Nohr itself. Compared to Hoshido, the difficulty is higher, with limited opportunities to earn experience and funds.
~Amusingly enough, the site emphasises that each of the two versions (Hoshido and Nohr) contains a similar amount of content as the previous game, Awakening. So you won’t be paying for half a game at all, if you buy just one of the versions.
~Yup, you can pay 2000 Yen with tax for a major DLC expansion, which follows a story where you don’t side with Hoshido or Nohr. This particular DLC will be made available at a later date.
