That trailer is great! I see they found suppressors.
Finally.
Hehe, to the guys a few weeks who asked why no suppressors? Easy - any found were probably were taken, and the reason other guns seem to be more available is that the walkers would obviously swarm anybody who shot an unsuppressed weapon.
Also, I believe Kirkman said in an interview that the reason they are referred to as walkers instead of zombies is that in the Walking Dead universe, zombies are an unknown entity (i.e. no movies, lore, etc.) which explains some of the questionable behavior of the survivors in the beginning.
That's really interesting, and explains quite a bit about their ignorance...
In that type of world, you'd have to be really "lucky" to a survivor.
No known zombies? Pssh, that's racist.