David Turnbull said:Start your squealing because a sequel to The World Ends With You might be in the works. Tetsuya Nomura has said that Neku?s appearance in Kingdom Hearts 3D: Dream Drop Distance ?could be taken as notice of something to come,? before blatantly saying that ?something is being worked on.? There?s nothing specific beyond that, but if you wanted hope, here it is.
source: http://nintendo3dsblog.com/is-there-a-sequel-to-the-world-ends-with-you-in-the-works
*commences the squealing*