The Steam Listing for Anno 1800 reveals that the next installment in this strategy series is becoming another of those Epic Games Store exclusives (thanks DSOGaming). This is another of those awkward deals, as the game was, and still is, available for preorder through Steam. They say preorders will be honored, but that they will no longer sell the game once it is released on April 16th. Here's word:

Notice: Sales of Anno 1800 will be discontinued on Steam after April 16th due to a publisher decision to make the game exclusive to another PC store.

The publisher has assured us that all prior sales of the game on Steam will be fulfilled on Steam, and Steam owners will be able to access the game and any future updates or DLC through Steam.

We apologize to Steam customers that were expecting it to be available for sale after the April 16th release date.