Deathwing is Coming

Deathwing is Coming !!!!
World of Warcraft News - Cataclysm

One of Azeroth's oldest adversaries will soon tear through the Elemental Plane to reforge the world in flame, but this foe won?t be conducting his reign of terror from the confines of a castle or lair. Deathwing is a destructive force the likes of which adventurers have yet to see in World of Warcraft, and his appetite for devastation can only be satisfied by the shattering of the world. Following his explosive escape from Deepholm, Deathwing will cast a deadly shadow over the people of Azeroth as he wreaks indiscriminate havoc across the land.
Once free to terrorize the world, Deathwing will randomly choose territories in Azeroth to attack each day until his ruinous reign is brought to an end. A blackened sky will be the only warning before every living creature caught in his approach is consumed by his terrible fire. The unfortunate victims of his malice will receive a rare Feat of Strength... as well as a repair bill and corpse run.
When Deathwing returns, you'd best keep your eyes on the skies.

Vampo also posted:

The pre-Cataclysm events have technically already begun with the earthquakes, though it obviously starts very mild and picks up over time. We don't want to ramp it up too quickly, but rest assured there will be a number of new developments as we get closer to Cataclysm. In fact, by the time the shattering of Azeroth takes places shortly before the release of the expansion, we might have to apologize for blowing your minds.
We'll have more information on the events coming soon.
(...)Each stage of the event does not have to be patched in, but rather just turned on. You can make a rough assumption that the event will play out for about a month, increasing in severity and things to do each week.

Are you ready to rumble?