According to PlayStation, if you pre-order Call of Duty: Black Ops 3 Descent DLC you will be able to get the Gorod Krovi Zombie theme. If you also own the season pas you cna get the zombies theme.
To apply the downloaded theme:
1. Select Settings from the function screen.
2. Select the Theme Settings option to display a list of themes.
3. Scroll to the desired theme, and then press the X button once to select and again to apply.