User blog comment:AntiScootaTwo/CoDWiki News - September 7, 2014/@comment-3515798-20140907200820/@comment-25494464-20140908232250

So basically:

1. Import and design a similar implement to the armory from Extinction into zombies

2. Allow players to make their own survivor

3. Make zombies a free roam world (this would make it better for the whole "make a survivor" thing)

I think it could work if Treyarch is able to implement it well.