As commented over on the official blog the update is theoretically complete, but there are issues logging in. I have managed it, eventually, and there are issues once you get in too: My friends list is normally about 600 long and doesn't include (hippos) or (waiting). It does include the one name I've blurred out in the picture, first in the alphabetical list. Friends online on the website is also broken at the moment. The new support systems are also detailed including the new region down reporting.
The good news? Well, I tried the new in-world wiki access (photo below). There are a couple of issues I've spotted, like if you close the page and reopen it defaults back to a tiny, practically useless window, if you minimise it instead it opens as soon as you select new text, but at least keeps its size. It is, however, fast and useful and might tempt me to use it more when I need to. 
1. How did you manage to log in? I am still unable to after about 10 hours...
Posted at 6:46AM on Apr 26th 2007 by Caroline Knight