I saw the same thing on the news last night Figment. I didn't sign up for it when I first heard about it because I thought it was insane to run a half marathon in Pittsburgh in August when it can be 90 degrees and 90% humidity. If they had it in September or October, I think there would be more willingness by the city to host this event and I think more people would sign up for it.
I was hoping to see a map of the course, but I don't think that was ever decided upon either. I could just imagine a course that went up to Mt Washington...in that heat and humidity, people would be falling over left and right. Although the city is losing lots of money over this, I think they did the right thing.
BTW Figment, good luck on Sunday!