For the past six months, Ironfell has been in beta. The game has changed dramatically in that time, with the addition of resource trading, epic ocean realms, naval battles and castles. There have also been some bug fixes and performance optimizations.
Ironfell is free to play. It's on the Google Play store, and Mac OSX and Windows versions can also be download from the Ironfell website. All platforms connect to the same massive, persistent universe consisting of 42,000 realms packed with 2.2 million user controlled units.
The next epic expansion will include dinosaurs, time machines and two new resource types. And that's just the beginning; eventually players will be able to blast off into space.