From:lineage2.com

The wait is almost over! We're pleased to announce that the Lineage II: The 1st Throne update will be going live on Wednesday, December 12. The current estimated maintenance period for the launch of The 1st Throne is 8:00 AM to 4:00 PM Central Time (3:00 PM to 11:00 PM GMT +1) on Wednesday, December 12. Event Gatekeepers will be back in the towns of Aden and Elmore to celebrate the launch.

During the server downtime for the launch of The 1st Throne, your character(s) will be moved to the nearest village. Also, the replays you created in Interlude will not be compatible with The 1st Throne, and can only be viewed in the Interlude game client. We apologize for any inconvenience this may cause.

More details about downloading The 1st Throne will be available on launch day, so stay tuned!