We’re getting some buffs!!!
Frost
* Threat of Thassarian now also causes Rune Strike to use both weapons when dual-wielding.
* Unbreakable Armor: Cooldown reduced to 1 minute and changed back to granting 25% additional armor while active instead of flat damage reduction based on armor. The amount of strength granted has been reduced to 10%.
[Frost Presence]: The damage reduction granted by this ability has been increased from 5% to 8%.
Ultimately, we’re going to be hardier and it appears dual wield tanking will be made viable! I’m very excited about this! There is also a nerf to pally threat, which while it will make our job as MT or OT easier in some regards, it’ll have a larger impact on the raid. Your best geared, highest level dpsers who can already touch explosive tank’s threat will have to watch their burst damage and threat even more closely and perhaps hold back even more.
You Yank It, You Tank it: Blog of a Tanking Death Knight Lady 
well… now we just need to have 2 slow tanking weapons..
or at least stoneskin gargoyle being able to put in one hand weapons.
Broken Promise looks like the most promising weapon to DW as a tank – lousy drop rate on it though 😛 But 2.5 attack speed, strength based with defense on it.