Aventurine's Tasos Flambouras recently checked in on the official boards to announce a delay on the upcoming expansion. The delay appears to be primarily performance-related. "The expansion is forced back a short while longer, we hope no longer than a couple of weeks, in order to get the performance right, and everything in the expansion working properly and tested thoroughly so there's no repeat of the last setback with the terrain feature," he wrote. Aventurine has also been having trouble with its network service provider, and the post provides a few details along those lines as well.
Now for the good news: treasure hunting is coming to Darkfall, courtesy of the aforementioned expansion. Players will be able to acquire map-reading skills from NPCs, make their own shovels to unearth various objects, and use treasure map hints to determine appropriate dig locations. "We are already planning on expanding this system, which means you can expect additional treasure hunt features being added on top of the one we talked about today," writes Aventurine's Laenih on the Darkfall forums.