To 2019 and beyond!
Nearly six years after its initial announcement at E3 2013, Kingdom Hearts III finally has a confirmed release date of 29 January 2019, with Japan due to receive the game only a few days prior. This release date was confirmed by Tetsuya Nomura himself at a special orchestra concert in Los Angeles. The date, he apologetically acknowledged, is a little later than the 2018 window initially promised.
E3 has just started, so we should expect to see more of the game soon.