Players have been waiting for the return of Assassin's Creed IV Black Flag in an updated format for a long time.
Recently, talks about a potential remake of Assassin's Creed IV Black Flag have intensified again. This time, the reason was not "insides", but a find by a dataminer with the nickname thequaliti.
In the November update for Assassin's Creed Shadows, he noticed a disclaimer in the localization table that clearly refers to another project:
Assassin’s Creed Black Flag Resynced — is a historical fiction created by a diverse team of developers. While the game is inspired by real world events, people and places, this game remains a work of fiction that includes creative license to adapt the material to the interactive video game format
Players speculate that the AC IV remake will be named without the number "Assassin's Creed Black Flag Resynced". The previous numbering could scare away newcomers who would decide that they need to study the previous parts before getting acquainted with this game.