Ok, this is what it actually says from the official posting:
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.
To verify that you have the launch version installed, you can check for the "assets_swtor_main.version" file in the following location on your computer: \Program Files (x86)\EA\BioWare\Star Wars – The Old Republic (assuming default installation). If you have that file present, you do not need to reinstall the game client.
With that said, some users may notice that their game client folder is much larger than 27 GB on their system. This may be due to having redundant files from previous versions of the client. If you need to clear up space, we recommend completely uninstalling the client and downloading and installing the launch game client. Again, we’ll update this post with more instructions when they’re available.
http://www.swtor.com/community/showthread.php?p=11786689