A cellphone is just as much as a legit game system as any other nowadays in Japan.
It's not even a follow up to KH2 as some of you think, it's merely a spin-off playing after the events of said game.
And putting a game franchise on various different systems is by no means a bad thing, if the games are decent. Sure, making money with this is definitely playing a role here, but that's their friggin' job.
Final Fantasy also has a title for almost every big platform I can think of right right now (except of the Xbox/360).
It gives so many different groups a chance to experience the series.
This common prejudgement that "Coded will suck, cuz it's on cellphone and I don't give a damn" makes me sick.
Play the game first, and then start complaining.
Nomura had plans to release it internationally, how he intends to do that, I don't know.
Our cell phones are often not as powerful as theirs.
It'd be really disappointing if production was permanently halted, as MuffinMan suggested. They'd have to look for a new platform to use to tell what happens after Kingdom Hearts 2, or scrap the plot of Coded completely.