SOE has yet to post any patch notes or give any type of sign that GU53 did indeed go to the test server last night other than the test server patcher downloaded a bunch of files. If some one notices some more file changes that happen later on please send me a PM.
Here are the following XML Changes found on the test server 8.27.09. The left side is what is on Live server and the right side is what is on the Test server. Changes are shown in red and some xml above and below the changes are left in for context.
Just checked... whatever they've patched to Test isn't the full GU53 yet, it might have just been a few early files, so that's probably why we're missing the UI changes.