Release tomorrow! I'm very curious about how well these guys kept themselves to the original storyline, most people don't even know of it... The story of Cave Johnson and the history of Aperture science, its hilarious, but I won't spoil it. Supposedly the official Portal 2 will also be about the origin of Aperture.
As for the voices, this article suggests that the original voice of GLaDoS was a synthesyzer, it was actually a voice actor acting like a synthesized voice. :p
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