StarCraft II is a sequel to the real-time strategy game StarCraft, announced on May 19, 2007, at the Blizzard Worldwide Invitational in Seoul, South Korea. StarCraft II is being developed for concurrent release on Windows XP, Windows Vista and Mac OS X. Though currently no release date has been given, it has been stated that development on the game began shortly after Warcraft III: The Frozen Throne back in 2003 and that the game development is "very far along and already playable in multiplayer with all three races". The game will feature the Havok physics engine, allowing "debris to roll down a ramp", as well as improved 3D graphics. Its lead designer is Dustin Browder.
Information came from the website that hosted the live stream. I'd trust them over some random on youtube. I'm not saying it's false, I'm just saying that it was a relatively reliable source.
Protip: There is no easy way to download it high resolution. I used a program to download it from a live stream.
Starcraft 2 is not out yet. There is no confirmed release date as of March 18th, 2008.