A Square Enix designer from Osaka updated their public LinkedIn page to include an entry for Kingdom Hearts 2.9, which is listed as a title for PS3 and PS4.
The page also includes extensive information on Kingdom Hearts 3 including involvement with Pixar, Gummi Ship system and even multiplayer:
Game Designer
Square Enix
August 2014 - June 2015(11 months) | Osaka, Osaka, Japan
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"Kingdom Hearts 2.9" (PS3, PS4) Development (10 Months)
-Game idea planning and documentation
-Game Check and balance
-Boss planning
-Attraction Flow planning and documentation
"Kingdom Hearts III" (PS4, Xbox One) Development (10 Months )
Original-level planning, documentation and execution for 2 Worlds
INCLUDING enemy, Item, secrets and event Management
-Mockup Creation of 3 Worlds INCLUDING temporary Asset Creation
-Game idea planning and documentation
-Game Check and balance
-Enemy planning and documentation
-Gummi Ship system planning and documentation
-Multiplayer planning and documentation
-Attraction Flow planning and documentation
-Main Scenario planning for 2 Worlds
-Various in-Game dialogue writing
-Translation and Interpretation of Contact Between Involved English and Japanese parties INCLUDING Disney and Pixar
-Publicity video Recording and editing
-Communication with Outsourced companies
-Holding Meetings with Disney and Pixar
-Team Management, Meeting Management and Proceeding Recordings
You can find the profile by searching LinkedIn while logged into your account. However, you must be either associated with the member or have a "Premium Account."