Google App Engine - New Pricing Official FAQ
groups.google.com
groups.google.com
It would be helpful if, before go-live, they allowed you to simulate the execution of your app under the new pricing framework to see how much it was going to cost. I don't want a big surprise the day of launch.
>We will be providing our customers samples of their new bills before the new pricing model is launched so that they will be able to see what will be changing.