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I heard WoTC provided some sample adventures for 4e, in a 3/4 parter that ended up with them fighting a black dragon.

Would anyone mind providing a link? I don't know what they're called, and can't find them otherwise.

As I understand it, WotC hasn't provided any adventures yet. Their 'Dungeon Delves' are not being released because they relied on information that was in the players handbook. What you've probably heard about are Raiders of Oakhurst, Second Son, Return of the Burning Plague, and Raiders of Oakhurst Reloaded.

http://www.enworld.org/showthread.php?t=220317
http://www.enworld.org/showthread.php?t=220473
http://www.enworld.org/showthread.php?t=220679
http://www.enworld.org/showthread.php?t=222233