Looks like servers are staying down for extended periods this patch Tuesday. You can find all the latest and greatest Blue posts updates on our Live News WoW page:

http://geeksmash.me/live-news/mmo/wow#blueposts

The latest updates comes from here, where Bornakk states:

Some new issues have been encountered that are affecting all realms and we are currently investigating them. Another update will be provided at approximately 3:00pm PST.

Good luck to all of you trying to get on today.

We'll update this post if we hear any more news.