The last few days have been a mad scramble, as I was done earlier, but when it came to deploying the project on the real live AppEngine, I ran into a series of production issues. The big one I posted about on StackOverflow, but after not getting any help there, I stumbled across this brilliant AppEngine/CodeIgniter boilerplate on GitHub, so I restarted the project from that and copied my controllers, models and views over there. That worked, so then it was small polish things.
+Ian Barber wrote a great post about improving the credential flow, so that inspired me to come up with a logo, which I did with the Drawing app in Google Drive. I also took out the Drive scope since I wasn't yet using Drive, although I think I will at some point, so the users can pull in files from Drive as well as save their results there.
Then when it time to submit the app, I realized the domain had to be in the format gcdc2013-X.appspot.com. D'oh! Since you cannot rename the instance name, I then had to go and create a new application, configure it, setup billing, etc for the new (& proper) name.
So now we wait & see.