So apparently the unabridged version of the audiobook for World War Z is in production. Nathan Fillion is doing a chapter. I don't know if it will be entirely re-recorded, or if cut parts will be added in, or what.
I loved this audiobook (it's in my shortlist of top audiobooks, along with Pride and Prejudice and Zombies, Neverwhere, Howl's Moving Castle, Ready Player One, and I Drink for a Reason), and I thought the original performances were really good.