EVE Online announced that some unexpected database errors were discovered after launching the Trinity patch. As a result, developers expect extended server downtime:

Tranquility is currently undergoing an extended downtime to deploy the Trinity 1.1: Boost Patch
This downtime was originally scheduled to end at 16:00 GMT. While monitoring the progress of the patch deployment, a database issue came to light that we felt was important to address as quickly as possible. In order to ensure the best quality patch possible for our players, the estimated time for the downtime has been extended as we correct that issue. Please watch the MOTD and our website for more information as it becomes available.

UPDATE

As reported earlier, database issues were discovered during an early point in the process. Those issues required us to go into our backups for data and this restoration and data integrity check have taken longer than originally anticipated. We regret any inconvenience these delays may cause. Our most recent assessment indicates that service may be restored at 02:00 GMT, and we will provide additional updates as often as possible.

We'll keep players apprised of any further news.