Anno Online was just announced at this year's Gamescom. Ubisoft introduced the free-to-play browser game and it is likely to appeal to fans of the series, who were recently treated to Anno 2070.
The trailer attached to the announcement is in German, so until we can track down one in English, you'll have to make do with the following screen, and the knowledge that Anno Online looks the perfect stablemate for the recently released The Settlers Online.