Quote from: Blizzard Staff

Cataclysm Class Preview: Rogue
New Rogue Abilities
Redirect (available at level 81): Rogues will be getting a new ability to help them deal with changing targets. Redirect will transfer any active combo points to the rogue’s current target, helping to ensure combo points aren’t wasted when swapping targets or when targets die. In addition, [...]

Quote from: Ghostcrawler

We’re doing our Cataclysm preview on the death knight changes later this week, but we knew one change risked overshadowing all the others, so we figured we’d go ahead and drop the proverbial Blood bomb today.
In Cataclysm, death knights will have a dedicated tanking tree, much like the other three tank classes. That [...]

Quote from: Crygil

We are making some adjustments to tank survivability based on what we’re seeing in Icecrown Citadel. We feel this is particularly important in preparation for upcoming Heroic attempts. This is tricky and occasionally subjective, so we might very well make more adjustments as we get even more data.
Paladin:
# Sacred Duty now provides 2 [...]

Quote from: Zarhym

We recognize that many plate tanks are making their gear choices based on the amount of armor they’re provided, as this is currently the most preferred stat. In order to make the tier-10 plate tanking sets more desirable, we will be adjusting the stats on the gloves and chest pieces in order to [...]

A very nice guide written by Dorkbad of Kul Tiras, Europe. Original guide can be found on wow-europe Death Knight forums.