The Black Desert Online team has announced that the Valencia and Siege Mode updates to the game are going to be delayed. They have not given a timeline for release but indicated that a technical issue that cropped up during the adaptation of Siege Mode to the NA/EU build is the cause for the delay.
In addition, the team is making some improvements to the security system in the game that will be specifically targeted at bots and other programs.
To compensate players for the delay, the Blackstone and Pirate Rhum events will be extended for an additional week.
Read the full notice on the Black Desert Online forum.