In preparation for 'Fantastic Beasts and Where to Find Them' which is set in the U.S., J.K. Rowling plans to release four new segments of writing about the history of magic in North America. The video description hints that tomorrow's piece will reveal more information about Ilvermorny, the magical school in North America. According to Pottermore, each piece will be released at 2pm GMT:
The first instalment of this exciting new series is called ‘History of Magic in North America’ and will be published on Pottermore in four pieces, starting tomorrow at 2pm GMT. Another piece will be revealed each day at 2pm until Friday 11 March.