Well, this isn't something anybody was expecting! Square Enix and GREE, Japan's leading mobile social gaming network, had a joint press conference in Japan today. They announced a new mobile title, The World Ends With You -LIVE Remix-, which will start service Winter 2012 in Japan! Due to the overwhelming success of The World Ends With You -Solo Remix-, the decision was made to create a social network version of the hit 2008 game!
Note that there is little information on this game and more will become available in the coming days, but it only appears to be a social network version of The World Ends With You.
Source: aibo_ac7 via Twitter, bKvEBVAvUq via Twitter, Famitsu