Thread:ComradeJ/@comment-11871234-20130822191518/@comment-11356046-20130823202353

^^

Google translate says

Please note that some new missions Enhancement now appear in the list after the maintenance of 22/08. These quests can not be accepted or completed normally at the time. The reason is that they will be used in the future in an exclusive event, which should arrive soon. To date they can not be performed.

These missions can be identified by the words "Event" in the upper left corner, as shown in the image:

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The part highlighted by the bolded text quite interesting. A new event eh? If it showed up in both the Brazil and North American versions, could there be a chance that NA will get an event like that too?

In any case, thanks ZombieW for providing this bit of info