I remember one game (Age of Empires?? Civilization?? SimCity??) where @ midnight Santa Clause flew across the screen.  Company gave no warning the 1st year, and subsequent years after reports confirmed it was a joke, but real. I think world of warcraft has christmas trees and gifts. These are 'seasonal' events, so only established companies could support such events.  It might be hard to find more. (btw - WoW needs to add a ninja-loot gift where when you open it, a gnome jumps...

What did they change in Supreme Commander2 from 1?

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In a secret room in a secret place is a terminal that North Korea's leader Kim Jong-il secretly plays World of WarCraft.  So secret because everyone knows all Koreans are suppost to be playing StarCraft or Aion.  But, 11/20 Aion issued a warning that the game stopped keeping track of level progress and was working on the problem, so Kim went grinding to level 80 on his new death knight, then the unthinkable....someone ninja looted from a 40 man raid, "Nooooooooooooooooooo!" he screamed...