http://www.techradar.com/news/kingdom-hearts-3-release-date-news-and-rumors

It’s been almost 12 years since Kingdom Hearts 2 was released, but the demand for Kingdom Hearts 3 has not faltered. In that 12 years way may have gone through one and a half new console generations and played many spin off titles, but the mainline Kingdom Hearts story has retained a constant place in the back of our minds.

[Update: A new report in Official PlayStation UK (scanned by KHInsider) suggests that Kingdom Hearts 3 may feature a playable Riku alongside Sora as well as a new world based on Fantasia. The quote states: