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We bring the informations of cataclysm,cataclysm gold,world of warcraft and so on.
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We know that Deathwing is going to tear Azeroth up in a big way. Take a look at the Cataclysm trailer for how destroyed the land is going to be. Barrens ripped in half, parts of Azeroth’s climate will change, and general hell will come forth unto the plentiful lands. We also know that the world event ushering in the Cataclysm is going to be big, really big. The event itself is not in the patch files yet.
It is possible that these mobs are the hidden game mechanic causing the screen to shake. And given that they appear to have been activated with patch 3.3, it does make at least some sense that they could be tied to the beginning of the Cataclysm world event.