there have been questions about the season pass and the new FRONTIERS DLC.
Following the important facts you need to know..

Season Pass

The season pass and its Content was introduced in October 2015: With TUNDRA and ORBIT the season pass includes 2 DLCs. More info:

Free Updates

Additionally there were 3 free updates for all playersr:

Frontiers DLC

The new FRONTIERS DLC is the final and extensive update of Anno 2205. As with all updates, FRONTIERS includes new content for all players:

Your Anno Team