from the official site:

Hey folks,
We just wanted to update you on our in-game server capacity status. Throughout Head Start we noticed the overwhelming response to the game and we are working on changes to further increase the number of people who can play Star Trek Online at any given time. Our current plan is to have these changes in place sometime this coming weekend. We will, of course, keep you updated on progress as it happens.
Really, we just want to thank you all again for your continued support and patience. If it wasn’t for you, we wouldn’t be here.
-The Star Trek Online Team