Advertisement Boards have been there since the game's start. They present short videos from commercial companies into your city.
In the Capital City: One board next to the Global Trade HQ is a permanant Landscape board presenting various ads. It will be there no matter any purchase. Another Board is on unexpanded land. It is a temporary board which moves from each unexpanded land. It will only show ads until all land is expanded, where it will disapear.
In Regions: It is the same as the Capital City, however the permanant ad is next to the Contest of Mayor's Building.