Now we will share with you some opinions drawn from one fellow player, who has concluded the things to do and not to do.
You should only face instagib problems when you can be crit since bosses no longer crush targets 3 levels lower than them. The fact that 3 of the tank classes are having trouble being uncrittable by Naxx is something we're look into. Druids can be uncrittable through talents.
Death Knights will probably have lower armor than warriors and possibly health as well. Their avoidance will almost certainly be higher to compensate for the lack of block. Death knights' situational abilities are better than warrior ones. We want to keep these differences as much as possible without gimping anyone. Everyone realizes that a 95% avoidance tank with 10K health is not going to be an effective tank, nor is one that is so dependent on cooldowns that he dies when the cooldowns aren't up.
If you are having threat issues, that is concerning. We are trying to get away from +threat modifiers on abilities because they don't scale well with with gear. For those we're keeping (like Sunder Armor) the threat scales with AP.
The ideal design is something closer to the paladin, where threat scales off of damage really well. If the death knight dps is too low, that would certainly account for lower threat as well. We don't want to have a lot of variance in threat on tanks. It's hard to balance (and not really much fun) to have low threat tanking classes.
Bottom line: the design is that the 4 tank classes are roughly equal in their ability to survive and maintain threat, while preserving whatever differences among them that we can manage.
By the way, the Improved Icy Talons of the Death Knight will affect ranged attack speed.

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