Debian has a habit of naming the testing branch that will end up becoming the stable one. For example Squeeze was the name of testing, when Lenny was the stable branch, before it became stable Squeeze. Wheezy is not out officially yet but testing is using its name. Once Wheezy is officially stable then the testing branch will be called testing or Jessie, then Jessie will be stable after a couple of years after Wheezy is stable.
Also Squeeze was officially stable, 2011-02-06. It is a few months away from two years.
Last edited by Rodebian; 10-29-2012 at 08:19 PM.