BioWare is going to launch a very limited version of what will become the Character Transfer Service on June 12th to move players from low population servers to more crowded servers. They have full details up on the site on how these merges will begin, and if you were a Star Wars Galaxies player it’s going to be almost exactly how SWG merged their servers.
Initially, it’ll be an optional move. Like in SWG there will be origin servers that can transfer to a destination server. They say there may be a cluster of origin servers that can transfer to a specific destination server, but exact details of what servers will be affected aren’t available yet.
This is the first implementation of their transfer service, and it’s easy to imagine that once they address the low population issues the game is suffering from, they’ll roll the actual transfer service out to normal operation.