#4 - Dec. 21, 2006, 3:49 a.m.
There is a predetermined amount of players set for the realms based on a design goal of approximately how many players are intended to be within a given 'game-world'. There are some concerns with realm stability factored in with having a concurrency-cap, but it's a side factor.
Once that cap is reached any additional players attempting to log in will be placed in a queue. Players entering into the queue aren't re-arranged by any factors, such as characters on that realm, level of those characters, etc.
The one exception being trial accounts. Players logging in on trial accounts will be given a lower priority and full retail accounts will always be moved ahead of trial accounts while in a login queue. Because of that, and also in our goals to spread out population evenly among realms, we recommend that you choose a realm with a lower population.