The season pass: As the name suggests a "Season Pass" gives your access to the 4 expansion packs that Treyarch will release in each quarter of 2013.
The price: 52 euros It should be noted that the map packs cost 15 euros individually: 4x15 euros = 60 euros total. Thus you will save 8 euros, by buying the season pass.
How to get the Season Pass:
Go to the multi-player mode of Black Ops 2.
Go to the Shop.
The Nuketown zombie map is also available.
Conclusion
When the map packs come out, you do have to pay since you already bought the season pass.
Revolution DLC
The first map pack (Revolution) was released on February 28, 2013.
The Xbox 360 version was released on 29 January, 2013
This applies to the map packs that will be released in 2013.
Uprising DLC
The second map pack (Revolution) was released on May 16, 2013.
The Xbox 360 version was released on April 16, 2013
This applies to the map packs that will be released in 2013.
Vengeance DLC
The third map pack (Vengeance) will be released on August 8, 2013
One month after its release on the Xbox 360. (July 02, 2013)
This applies to the map packs that will be released in 2013.
Apocalypse DLC
The fourth (last) map pack (Apocalypse) will be released on September 27, 2013
One month after its release on the Xbox 360. (August 27, 2013)
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