EB games here is Australia have advised that NO bonus map or any other dlc is available for the WiiU.
All other consoles confirmed to have Bonus Map and extras EXCEPT WiiU.
Refer their ads here:
https://ebgames.com.au/ps3-161128-Call-of-Duty-Ghosts-PlayStation-3
https://ebgames.com.au/wiiu-161131-Call-of-Duty-Ghosts-Wii-U