Recently, the Battlefield 6 page on the Xbox store received an update. An age rating was indicated for the game.
If this is not a mistake, then Battlefield 6 received an "M" (17+) rating from the ESRB and there is a comment: "Blood and Gore, Intense Violence, Strong Language."
It is noteworthy that "Gore" was not mentioned by the ESRB on the pages of Battlefield 2042; Battlefield 1; Battlefield V, i.e., the new part of the franchise has a chance to become the "most brutal" since BF Hardline.