The developers want your feedback about each class and questions for the developers.  Read first the patch notes to identify the changes introduced in patch 3.1.2. Play around your class once the live servers come back online, specially tonight when you go to Ulduar. Any bugs or suggestions should be posted at the following forum threads.  Try not to create new threads about this topic. The developers will be reading all your feedback in these class specific threads.

More threads will be appearing in upcoming days and weeks. For now these are the class threads available:

USA

Europe

 

Blizzard Quote:
We are looking for community class questions and topics for a class Question & Answer series. Over the next few weeks, we will be posting in each of the class forums and discussing the latest high priority questions and topics the community has. We will then be compiling these questions and topics into a larger Question & Answer post to address as many of questions as possible. While we will be creating one post in each of the class forums to solicit questions and topics of interest, we will also be keeping a close eye on additional posts and discussions.

It is important to keep in mind that we have a schedule of classes we will be addressing and will be getting to each class individually over this period of time. Please note, this list is subject to change.

Shaman
Mage
Warlock
Death Knight
Paladin
Warrior
Hunter
Druid
Rogue
Priest