Maplestory DS

It likely will be from the looks of it, most DS games are.
It does appear to be story focused (which is nice, maple could always use more lore), and the only reason I'd want to play it again is to try multiple classes probably.

That said, it is a 1 player, offline game, there may be local multiplayer, but as I recall there is zero online functionality.

Well, next to local multiplayer, Final Fantasy Crystal Chronicles: Echoes of Time, had a multiplayer that worked the same gameplay wise, but online. Seeing as the game isn't too graphic heavy (it's probably a 128mb or 64mb file) the rates of lagg, even when online, and the fact that Nexon knows how to set up things like that, the chance that Maplestory DS will have a similar thing is pretty high. Maybe you could even send items to your Maplestory account (like Pokémon Platinum, Heart Gold and Soul Silver have Wii messaging, and e-mail function in Japan too). I wonder if they're going to use all the things they could to make this game sell, or just treat it like a side project.