At Tokyo Game Show 2012, Square Enix announced Kingdom Hearts for PC Browsers, an upcoming social web browser game with a tentative title. Since then, some screenshots and information has been released, but we still know relatively little about the title.
Today, we have discovered that Korean publication INews24 have published some information about the game. The game, which they refer to as "Kingdom Hearts online game", is being developed by a Korean studio known as "Studio EX", which was recently acquired by Disney. Series director Tetsuya Nomura mentioned in October that the game was being developed externally, so this checks out.
The article also mentions that the title is expected to become multi-platform, and released on smartphones as well as on the web browser. We have obtained a direct translation of the relevant part of the article, thanks to kalnet from KH13, and this translation can be read below.
A Kingdom Hearts online game is being developed. Studio EX is expecting it to become a multi-platform game, where you can enjoy the game on smartphone or on the web. The action is likely to be a game similar to the MORPG genre.