The first one to talk openly was GameXplain but other sources as Emily Rogers have confirmed to heard the same rumor.
https://www.youtube.com/watch?v=8aa-QIFpw7E
Starts around 18:00 minute.
Summary:
- 4 large dungeons
- 100 mini-dungeons scattered around the over world
- Dynamic weather
- Tech vs Nature
I'll try to update if further info comes.
NOTE: Confirmation is about hearing the rumor not about the content, and none has mentioned if it comes from the same source.
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