UPDATE 2: According to many users, Nuketown 2025 is now a mandatory download. If you delete this map from your Xbox, it will make you download it to play MP again. Customers who have not downloaded this map on Xbox 360 can download it now for FREE. Nuketown 2025 is coming April 12th to PS3/PC.
UPDATE: We have been informed by a few people that the mandatory download for Nuketown 2025 has been delayed till further notice due to unexpected changes. Stay tuned, we’ll update once we know more.
A new message on Black Ops 2 on Xbox 360 has confirmed that the Nuketown 2025 MP map will be a mandatory download starting March 26th.
Nuketown 2025 is available now to download on Xbox LIVE for free, but on Tuesday you will be required to download it in order to play MP.
Treyarch is doing this so that they will be able to put Nuketown 2025 in all the playlists.
This map (along with the other optional Micro Items) will be available on PS3/PC at a later date.
SOURCE: Black Ops 2