Kingdom Hearts producer (and theoretical
Final Fantasy Versus XIII lead) Tetsuya Nomura told Famitsu that the appearance of
The World Ends With You's Neku Sakuraba in
Kingdom Hearts 3D: Dream Drop Distance portended other things for the character in the future.
According to
Andriasang, Famitsu asked Nomura if Neku's appearance provided notice of a sequel to the Shibuya-based DS RPG. Nomura didn't quite confirm a sequel, but he did say that the appearance suggested "something" that Square Enix is working on.
Last year, Nomura said he wanted to make a sequel to
TWEWY "when the time is right." Perhaps the time will be even closer to right two minutes from now, when you've watched the new trailer above (featuring Neku).
Reference - http://www.joystiq.com/2011/09/21/the-world-ends-with-you-cameo-in-kingdom-hearts-3d-notice-of-so/
Pretty much the only reason why i even have a 3DS.
Oh, but I also have my 3DS for Zelda