Rumor: The World Ends With You Possibly Hinted At By Square Enix Website
A sub-domain has appeared on Square Enix's website labeled Subaseka, which is similar to the Japanese title for The World Ends With You, which is Subarashiki Kono Sekai.
Characters from The World Ends With you appeared in the recent Kingdom Hearts 3D: Dream Drop Distance, and back in April Tetsuya Nomura offered hints about a new entry in the series. He said, "regarding The World Ends With You, I can't say anything at present, but there probably is something."
The Square Enix site has a countdown that is ending shortly. Maybe we will find out more soon.