Features
Anno 1503 is based on a whole new engine, so it won't be an add-on for Anno 1602. It's an entirely new game.The most important new features in Anno 1503, compared with Anno 1602, are:
The map is ten times as large as in Anno 1602 and the islands are bigger
The terrein is not flat anymore, but also contains valleys and hills
4 different views and 3 zooming levels
Different climate-zones and landscapes, like deserts, tundra's, jungles and all with its own vegetation, animals and resources
Advanced warfare, many different tactics and weapons
Advanced foodchain
Smart AI with it's own behaviors and interactions
New ships with more possibilities
9 different native peoples (Aztecs, Africans, Moors, Mongols, Eskimo's, Cave-people, Indians, South-Americans and Beduins), each civilisation with it's own behaviors
New multiplayer options, more than 4 players on one map and a new gameplay
Advanced graphics, more than 300 buildings, 175 of them can be build by the player