There is a possibility that what we see on the test server will not transfer over into the game. The point of the test server is to see how the general populace uses the new spells/abilities and that it is not unbalanced in regards to how the devs want the game to be, or that there aren't bugs with how the spell/ability/new content is intended to work. So there is a chance that between the time that we use the spells/abilities/new content on test server and the time it is released there could be changes to the way it all behaves if it isn't following the model the dev team initially wanted it to.