We do not know whether or not this was used in the Lich King kills we've seen so far (Ensidia's kill screenshot suggests they did), but Daelo hit the European forums to make the announcement that they've temporarily disabled Saronite Bombs and the Global Thermal Sapper Charge. What does this have to do with the Lich King? Well, Daelo says...
We just made a hotfix that disables the siege damage dealt by Saronite Bombs and the Global Thermal Sapper Charge. The siege damage of the bombs was causing the Frozen Throne platform to rebuild, which greatly decreases the difficulty of the encounter.

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