YouTube
(All the video's on the main page rick roll you)
Blizzard
(Bard class coming in expansion, plays guitar to do damage)
Selecting an ability launches the Fret Bar, which will display a number of riffs the player needs to activate using a new guitar-based keyboard peripheral that will ship with Wrath of the Lich King (a special Frostmourne-themed axe will be sold separately)
EDIT: More stuffz:
Rotten Tomatoes
(Titanic 2 with Leo's character found in a block of Ice. A very realistic Zelda trailer, AAAANNNDDD...
Vin Diesel of Fast and the Furious fame as THRALL in the World of Warcraft movie. Set in the same style as Beowolf. The story will showcase the events that took place in Warcraft 3. Also staring Tyrese Gibson as Illidan, Paul Bettany as Kael'thas Sunstrider, and Zooey Deschanel as Lady Sylvanas.)
Post more awesome Aprils Fools you guys have seen!