Just found this on the forums:
In preparation for the official release of Star Wars: The Old Republic, we wanted to make sure that everyone has the correct game client installed on their machine.
If you participated in our Game Testing Program before November 25th, we recommend that you uninstall the game testing client (refer to instructions below) and then download and install the launch game client. We’ll update this post with more instructions when they’re available. The size of the launch game client is approximately 27 GB.
If you have played in our game testing program at any point from November 25th onwards, you will not need to re-install the game client, as you should already have the launch version installed.
Here's a link to the whole thing:
http://www.swtor.com/community/showthread.php?t=714124&highlight=uninstall