Overkill, the studio behind the Payday series, is currently working on a four player co-op FPS set in The Walking Dead universe. As you might imagine given the setting, close quarters combat and stealth are going to represent a major part of the gameplay, though if you ever get discovered you'll also be able to throw caution to the wind and go guns blazing. Just be warned, sound can and will draw in additional hordes of zombies!
As for the four characters themselves, each one will have their own special abilities, skill trees, playstyles, and perhaps most importantly of all, strong personalities. Given that this is a co-op game we're talking about, you can expect to see all of the characters have some noticeable weaknesses, weaknesses you will need to compensate for with good ol' fashioned teamwork. For those of you that have played Payday 2, I think it's safe to say we can expect to see something similar to it's specialization system.
There are very few gameplay details currently available, but if you would like to learn more about the characters themselves, you'll be glad to hear that Overkill has released four lengthy and rather interesting videos covering just them. Have a look, starting with the most recent one for Heather:
Overkill's The Walking Dead will be coming to PC, PlayStation 4 and Xbox One in Fall of 2018. Once more information comes to light I'll make sure to cover it, but until then you can learn a tiny bit more by heading over to the official website.