Pythonista is a great app, no question. However, there are obvious lackings to attend to.
1. No support of camera or accelerometer.
2. Difficult to navigate code (take inspiration from Codea. They have great navigation.
3. No useful documents -yes, there are docs, but they're indexes. You need well written, user-friendly documents that are easy enough for a beginner and complex enough for an expert.
4. No 3D support- this is a biggie
5. No physics engine- again, look at Codea.
6. Not very many examples- a good game and maybe something really cool, perhaps a web browser.
I hope you read this and realize the flaws and try to improve them. Sorry if this sounds negative, but I'm just trying to suggest some features. I really like this app and python is my proffered language.
-anonymous person :)