NCsoft just announced that paid character transfers will go live in Aion on April 27 for the price of $24.99. More details, including a FAQ, will be released closer to the launch date.

Community Coordinator Katherine "Trine" Field later clarified in the discussion thread that "this process will take into account your faction, your source and destination servers. Those servers where your move would add to unbalancing the server would not be offered as options when you are given selections."

Trine also commented that there may "possibly" be some sort of deal for transferring multiple characters for a single price "since most everyone has a main and a production/crafting alt and in reality it's really only one person playing them all." Of course, this is not confirmed and we'll need to wait for the FAQ for more details.