Tetsuya Nomura, via the official Japanese Kingdom Hearts Twitter account, has confirmed that a new Kingdom Hearts HD 2.8 Final Chapter Prologue trailer will be released at 4:00 AM USA EDT (17:00 JST, 1:00 AM USA PDT) on September 13th. Translated tweet from Tetsuya Nomura can be viewed below thanks to @r_kane1

We will premiere the latest Kingdom Hearts 2.8 PV, a bit on the longer side, from JST 9/13 17:00 onward. We will inform of you the URL via this account, so please tune in. Today's PV will finally have some...! But before then! @ Nomura

The official Twitter account will be sharing the new trailer. as soon as it releases.