Thunderclap and Icy Touch don't stack, at least considering the melee portions. That's part of the raid consolidation pass I have referenced a few times.
If Frigid Dreadplate was changed to something like -AP when you hit a DK, then it could act like Demo Shout. It would work on bosses but wouldn't stack with Demo Shout.
Some other classes might be sad when they find their awesome raid buff no longer stacks with someone else's raid buff. Nobody has played a DK for years at this point so anything that feels like a hit to "you MUST bring a death knight" stings, but probably less than if a shaman or paladin starts hearing it about their class.
Say we gave DKs a talent that allowed Icy Talons to apply to the whole raid, but it didn't stack with WF. The first reaction is typically, well that sucks because EVERY raid brings an Enhancement shaman, and that's true today. But at some point if there are enough classes who offer +haste, then the haste buff is mandatory, but WF is not. What if all the +AP buffs didn't stack? What if all of the +spell damage buffs didn't stack? That's the kind of thing we're looking at.
冰触和雷霆一击的减物理攻速部分是不叠加的；冰冷板甲（DK的被击中后一定几率使攻击者减攻速）可能会改为使目标-AP,但是如果改动了也不会和挫志叠加；很多其他职业的raid buff/debuff都不再会和不同职业的叠加了（译者注：如前几天提到的元素诅咒和暗影交织+悲惨/DK的乌光瘟疫）。所谓“raid必须带DK”这种想法是无稽之谈。
风怒改为攻击加速图腾已经是近乎铁定了。可能会有天赋让DK的冰爪加速buff变成全团的，但是不和风怒叠加。大家的第一感觉就是“这改动扯淡，哪有不带增强萨满的团？”但是在很多职业都能提供加速buff的时候，加速Buff成了必需品，不代表风怒图腾会成为必需品。我们正在考虑调节各类buff,使得同类（比如+AP的或者加法伤的）不会互相叠加。至于效果如何——我们正在测试中。
