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 2009[]
Conquer The Seas Expansion - December 2009[]
Hellfreeze - October 2010[]
NOTE: The developers addressed the player base, letting them know that the code name "Hellfreeze", had nothing to do with it's late release.