Warning: What I'm about to talk about relates to the current rumor. If you have not read it, I highly recommend you do.
So, there's a rumor going around that RE8 is in it's early development stages. It was by a leaker on Twitter named EvilVR, he's leaked about RE2 Remake, but, he has been incorrect in the past, so take it with a grain of salt. He said that RE8 will take place after RE7 on an Abandoned Island where the laboratory of RE7 is. And apparently, you have to uncover the truth. I'll only talk about things he has not said such as Characters, Weapons, Monsters, and the perspective view of things.
Characters: I expect an original protagonist this time, like Resident Evil 7's Ethan Winters. So, basically I believe there should be returning characters such as Chris, Jill, Rebecca, Leon, Claire, Ada, Sherry, Jake, and maybe Ethan if he's going to be involved in this.
Weapons: I think Capcom will make the weapons from RE7 return. And I think another great thing to do is put weapons that have not been in a RE Game yet. Like a Blunderbuss, Lever-action rifle, Metal Storm, BB Gun, Varmint Rifle, etc.
Monsters: Of course, I think we can get zombies in RE8 since they were supposed to be in RE7. And I think the mold will return too since this is where Eveline was created. We obviously need the return of Hunters, Lickers, Cerberus, and maybe even Mold Zombies would be a cool new monster.
Point of View: I think they might try to make it 3rd-Person because of the success that RE2 Remake had. I think people want the series to go back to that POV. Sure, RE7 was scary but because that was a first-person, not a lot of people really liked the idea.
Well, that's my speculation on RE8.