Ubisoft to release 5 AAA titles between October 2020 and March 2021, more information on the titles and launch timing in May | ResetEra
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This means that either the next Assassin's Creed game has been delayed to 2021, or Ubisoft pushed one of the already announced AAA titles to 2021.
UPDATE: the 2 unannounced titles are titles from their biggest franchises, so likely Assassin's Creed and Far Cry