#0 - April 22, 2009, 12:41 p.m.
They are there for you by phone and email, and you can access the full support site below - which also includes general assistance on in-game topics and new content.
Patch Day FAQ - http://eu.blizzard.com/support/article.xml?articleId=20110
Contacting Technical Support - http://www.wow-europe.com/en/support/technical.html
Blizzard Support Site - http://eu.blizzard.com/support/index.xml?gameId=11
3.1.1 Patch Notes - http://www.wow-europe.com/en/patchnotes/