Sounds very interesting but dammit, at least in Japan, it's been announced they're pulling a Pokemon pricing structure.
(that is, your path is determined by which copy of the game you buy. Wanna play the other one? Gotta pay nearly half the cost to DLC it.
Then again, the announced price of a total of 4700 + 2000 yen is probably about what Japan would normally pay for a new 3DS game. So maybe the western release could skip that?
But I wouldn't count on it, in the last couple months, Nintendo has pretty much abandoned their "no evil DLC" promise they made years ago.)