Since the release of Darkfall Online, Aventurine has released three major updates to the games. Even though they are called "Expansions", the majority of the content is really bug fixes, and unreleased content that was shown on release, but not released.
Darkfall's First Expansion - July 2009Edit
Conquer The Seas Expansion - December 2009Edit
Hellfreeze - October 2010Edit
NOTE: The developers addressed the player base, letting them know that the code name "Hellfreeze", had nothing to do with it's late release.