So I was looking through the DLC page this morning hoping for an announcement of LB soon, and it turns out we're getting Rogues and Future Past in the next few weeks: http://www.nintendo.co.uk/games/oms/fire-emblem-awakening/connect-addon-content.html
I'm quite excited bout being able to play FP so early, but I had my fingers crossed for one of the DLC classes :(