It was announced today that this year's D23 Expo will feature a one hour event celebrating the 25th anniversary of the Kingdom Hearts series, titled 'DEEP DIVE into KINGDOM HEARTS', scheduled for August 15th from 4:30-5:30 pm PST:

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The event will include some of the series' voice actors and creative minds, and may potentially provide us our next look into 'Kingdom Hearts IV'! This event is significant in that it is the first D23 event dedicated entirely to Kingdom Hearts.

Source: D23 Official Website