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It works in a lot of countries, but I suppose with this no cross region thingy steam has I shouldn't call it that then.
It's a CD key but I don't think it will work in Brazil because your store has this warning:
Notice: Purchases made in Brazil are only playable in Argentina, Bolivia, Brazil, Bahamas, Belize, Chile, Colombia, Costa Rica, Ecuador, Guatemala, Guyana, Honduras, Nicaragua, Panama, Peru, Paraguay, Suriname, El Salvador, Uruguay and Venezuela.
Preorder is uncensored and comes with the Ultimate Fellowship Pack
http://steamdb.info/sub/32186/
Should only work if your country is NOT in the purchase restricted countries.