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Starcraft 2 CGI Announcement Teaser Trailer in South Korea May 19th 2007 Korean time. You can check Blizzard.com for more information once their official site is displaying StarCraft 2 information and higher quality trailer.
Offical Press Release
http://blizzard.com/press/070519.shtml
In game video of Starcraft2
http://www.youtube.com/watch?v=afxJW53c39o