User blog comment:Answeration/The true enemy in AC3/@comment-3276576-20120614171512

I actually have some information on the pre-order missions, if someone is interested (I would add it to the Wiki, but don't have the time right now).

Lost Mayan Ruins will take place on Cozumel Island in Mexico. Connor travels there with his ship, searching for Captain Kidd's treasure. The map will mostly be set outside apparently.

Both A Dangerous Secret and Ghost of War are ship missions, they will mostly take place at the sea.

The source is here, along with more interesting information.