I'm not sure this'll really be all that marketable in the west though.
Minecraft as far as I know isn't nearly as popular in Japan as it is everywhere else, thus allowing SEnix to market it as if it was a "WHOLE NEW GENRE!!!!1!!1" with the gaming proletariat there likely not being in the know to call them out on a clear as day Minecraft clone with RPG elements - Just like the "There is no other game like Spelunker!" comment made during the new Spelunker's livestream announcement, in face of the fact that Spelunky has been out for years and is infinitely more popular than Spelunker has ever been in its 3 decades or so of jankiness.
I mean, how are they going to be able to market this in the west? They'll be called out big time if they pretend it's a whole new genre, and the market has shown that there's only room for ONE Minecraft, with clones on XBLIG and AppStore failing left and right - With the sole copycats to have any measure of success being ones that in truth aren't Minecraft clones, but FPS games that take advantage of the concept of a destructible and buildable voxel world like Minecraft's, as seen with Ace of Spades and Blockstorm, with Murder Miners tailing them.
So yeah, would there be any potential for this in the west? It'd be releasing into a genre which might as well be the Highlander of gaming, with the added stigma of the dreaded non-DBZ/non-Ghibli anime artstyle which has often been considered in the past decade to be a factor in poor western sales on its own.
So I say, pack it up on expecting this unless Heroes does well, because as far as I know they've not even announced XI for localization yet, which I'd say is sort of a sign since even Star Ocean 5 is confirmed for localization, and was within a negligible amount of time from its Japanese announcement.
Edit:
And hell, I'm even cynical on Heroes anyway. If you ask me, its localization, next to the recent Warriors-craze of sorts, as far as I can tell is just a knee-jerk response to how well Hyrule Warriors did, rather than an earnest attempt to truly bring the series back in the west. tl;dr since that sentence went through multiple awful iterations: It's being localized because it's a Warriors game.