I can't wait for respawning migrating zombies. I'm just wondering if there will be an escalation in zombie numbers as time goes on? I remember there being more and more zombies as time went on in a build a while ago and I've really missed that. I think it could work either as a slow creep or even as a set time event. Could be explained as populations from nearby cities moving in so every 20 days or so another horde shows up and the numbers shoot up. Either way as time goes on you get more gear, skills and fortifications which makes it easier to survive but as far as I understand the zombie number (aka the challenge) is planned to stay the same. I just feel the game should get harder the longer you survive not easier.