I'm working on my own Walking Dead rules system. The basics are done and I now need to write the campaign part. I have a lot of ideas on developing your community, leader types (inspiring, dictator, maniac), sending out teams, etc. I just need to write it all down. But I think a zombie game really needs attention *between* games to work in the long run. I don't believe that much in extreme character development in terms of stats (like Necromunda), but more in a story-based experience. So characters develop their story and relationships, similar to TWD.