The Black Desert Online site has been updated with the news that regional mega servers will be coming beginning November 30th. Called the New World update, the plan is to provide players with fiercer PvP siege battles and a more robust and broad economy. Players will note changes coming beginning November 26th when Siege Battles will stop with full transition to the mega server being completed by November 30th.
The site has a handy FAQ that answers a number of questions about the process and its effect on players at the current time. Topics for players with multiple characters on multiple servers include:
Check out the full announcement on the Black Desert Online site.