Are we getting a new Assassin's Creed game? Yes. Unfortunately, we don't know where it will be set.
An earlier report claims that the next Assassin's Creed game will feature the Aztecs and hints that the new location will be somewhere in Central Mexico. But, Bloomberg's Jason Schreier disputes this. In a reply on Reddit, the investigative journalist claims that "the next AC game is Rift, which is set in Baghdad." This would be in line with a report in February claiming that the next Assassin's Creed game will feature Basim and was originally planned to be an expansion to Assassin's Creed Valhalla.
In Assassin's Creed lore, Basim Ibn Ishaq is a Sage and the human reincarnation of the Isu, Loki. He plays a conflicted role in Assassin's Creed Valhalla, so a game centered around his earlier days as an Assassin could help shed some light on his background. In addition, Basim grew up in Baghdad. This is further "proof" that he could be the star of the next Assassin's Creed game.