Publisher's description on their announcement video on YouTube
Completely redesigned for mobile, Stronghold Kingdoms on iOS and Android will feature new controls, a touch-based interface and all core functionality of the PC and Mac versions. Castles will be just as easy to build, siege and defend, with simple one-touch gesture controls and UI rebuilt from the ground up for smart devices.
Rule as you desire and become a feudal Lord in Stronghold Kingdoms, the world’s first castle MMO. Join thousands of players online as you build your village economy and design a mighty stronghold to protect it. Farm peacefully, engage in political mind games, seek vengeance on sworn enemies or lead your armies to glory across the country, Europe or the entire world! Research new technology, siege other Lords, join player-led Factions and expand your medieval empire!