Darkfall Online's lead developer, Tasos Flambouras, has posted on the official forums that the expansion will be delayed slightly to Tuesday, October 5th. The team discovered some systems that need to be retested to avoid problems when the expansion officially launches.
We wanted to let you know a decision was just made to hold the expansion off until this coming Tuesday. Our internal milestone was to launch it today, but we unfortunately discovered that we need to re-test some things to minimize the chance of problems after the launch.
We have a clear picture on what needs to be done, and most testing has been concluded, so we don't anticipate any further delays.
We apologize for this extra delay, and we hate having to postpone one more time, but we can't leave any loose ends before we launch. Thank you for your understanding.
Read more here.