This is not breaking the rules. There are many people playing Cabal at this very moment. If you want to play now instead of waiting till the 18th. Here is how. Go to
www.cabalonline.net Sign in on the main page. Then in the same window after you are signed in copy and paste this
http://www.cabalonline.net/Download/PopDown.aspx
You will get a pop up for the Cabal Launcher. Click yes to install the launcher. After that it should take you to the server selection screen. So just click the server and pick a channel to play in. Then you can create your character.

Hope You All Enjoy