Resident evil 8 will join the game and not a older title, here is why
Firstly in the announcement trailer we see that the survivor is a man who the face is not shown. Who else is a men in resident evil 7 and 8? Ethan and we don't know how he looks in resident evil 7.
Also, he is the main character in the newest game, why would behavior use a older monster and survivor when they can collapse with the newest one.
For people who said he dropped a umbrella logo charm in the trailer:
In the newest trailer of re8 we see the umbrella logo too.
Also I don't think how nemises could work in this game