In last week's activity report, Darkfall Developer Tasos Flambouras said that he recently gave a short postmortem on the game's development at the Hellenic Game Developer’s Conference. In the speech, he talked about the the next expansion/relaunch and mentioned plans for the sequel to Darkfall.
As one would expect, the brief mention of a Darkfall sequel and relaunch confused many players. In an attempt to provide some clarification on the matter, Tasos just posted a thread outlining Aventurine's future plans for the game. He says the team hasn't diverted resources to a Darkfall sequel, and there are no plans to replace the current game with a Darkfall 2. Basically, it appears that a sequel may be part of Aventurine's long-term plans, but that doesn't mean the company is currently working on a new game.
Tasos also confirms that the team is in the process of developing a major expansion for Darkfall. It can be considered a relaunch, but Aventurine will not be wiping the servers. The relaunch simply means that "it may give fresh options to new and existing players."