You should post something so that people have a better idea about what you're asking. If you mean like Left 4 Dead style zombies, then I disagree. I like the way it is now. But if you mean a different variety of zombies instead of just the same alien looking zombie then I agree.
I assume you mean L4D style, so I voted no. But if it's purely asking about aesthetics, and not gameplay, then I do hope they add more.
They aren't adding new zombies, but they are changing a few things about the zombies in the next update. They'll be faster, persistent across the entire map (before, to make the game run more efficiently, they could essentially walk through walls if they were far away from you), and able to get knocked down and get back up.