During one of the Unexpected Visitor cutscenes, there is a name at the very bottom, it reads Genette. I did not catch the first name sadly but I have an interesting theory I hope is correct.
So Nagase has already at the end of the AC7 campaign. Snow (Swordsman) and Harding (Edge) appeared at the start. And even though he died, Andersen was mentioned via the aircraft carrier.
I have to wonder if Grimm (Archer) and Blaze are going to make a comeback in the new DLCs. I also would like a nod or mentioning of Davenport (Chopper).
I personally hope so as AC5 is my favorite in the series.