Kingdom Hearts: Birth by Sleep Final Mix, like every other Kingdom Hearts game, has a brief teaser pertaining to a new chapter in the series at the end of the game. KH13.com have managed to get their hands on this ending/teaser, and it makes mention of a “Birth by Sleep Volume 2.”
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BBSFM Secret Ending Part 1 from DChiuch on Vimeo.
The teaser shows clips from Kingdom Hearts games that take place after Birth by Sleep, including scenes from 358/2 Days. Could a potential Birth by Sleep: Volume 2 story take place after or perhaps during these events?