Walking Dead needs a lot of zombies, so clearly it needs Zombies popping up from under the playfield.
It needs some very scary lighting schemes and flashers obviously.
It needs simulated blood spatter.
A toy like the chest in TOM, that has four sides, with a zombie on each side.
IT HAS TO have moving zombie targets that come down the playfield! that you have to fight back.
It needs a big shotgun toy that fires pinballs.
It desperately needs and LCD monitor with video.