Quote Originally Posted by Davorok View Post
If you have an inactive account, your characters will be held in limbo, when you log on you will be automatically added to a world.
That has not been explicitly stated and I believe this little blurb may speak to that concern...
If you wish to avoid being automatially assigned to a new World, we suggest that you create your character after the World merge maintenance is completed.
Although this refers to Newly Created Characters, I think this applies to existing Non-Active (non-paying) Characters as well. Activate your account after the merge ends and you can choose between any non-full servers.

Obviously we need more info and clarifications so I will stop speculating, go to bed and check for Rep Responses in the morning. ;>)
Slow down, there. Actually:
To select a destination, an existing playable character must be associated with a player’s service account. As long as a player has at least one usable character, a destination World may be chosen for all characters in the service account, including characters that have not yet been paid for.
Players who do not select a destination World during this period will be automatically distributed across the Worlds.