Still not working (yes, the old updater). Even though it's officially discontinued, I'm going to use it until it just refuses to run on my PC. Last time I tried the new updater, it messed more things up than it fixed, so I've decided to stick with the one that was actually working and posted a bug report (long time ago).
Doesn't really look like it was a DNS problem since the updater tries to read
http://www.wowinterface.com/patcher/favs/[stuff-no-one-needs-to-know]/nonameform.xml which is simply not there anymore as it seems to me.