We don't know the internal of iOS7. Maybe it is easier to monitor than the old versions if Apple was secretly coerced and cooperated with NSA? Remember the NYPD was encouraging people to update to iOS7 when it came out?
If you're planning to buy a pro, buy it now. It's the best value when it comes out. Don't wait for 6 months when the prices of all components come down and Apple will still charge the same price for the same pro. Then wait for the next refresh instead.
Apple can just survey the developers to see who wants to participate the program and developers may also limit the number of "free" copies to give out. And Apple can display a special page for people to choose their own likes. Every day is different for 12 days. That'll be more interesting.