Starcraft beta central
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Starcraft had a long and exciting history of being developed. It has been delayed many times and could have came out in 1996. What took StarCraft soo long to develop into a final product??
As Blizzard finished warcraft2, it became a remarkable success. Afterwards blizzard has dedicated itself to be a good company. They have rushed to make a Starcraft their new game. It would be basically an improved warcraft2 2. It would have 3 races and they would be totally different, as opposing to warcraft2 2 with its mirror images. But as they almost finished their StarCraft game, they released it to E3 show. After that it was criticized soo much, since it looked too much like warcraft2.
From then, they totally changed the game engine
StarCraft beta central - Source